GB2479650A

GB2479650A - Navigation device determining a maximum possible speed of a vehicle within a remaining region of a speed measurement section

Info

Publication number: GB2479650A
Application number: GB1106353A
Authority: GB
Inventors: Stefan Pirklbauer
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2010-04-15
Filing date: 2011-04-14
Publication date: 2011-10-19
Anticipated expiration: 2031-04-14
Also published as: GB2479650B; CN102235870A; CN102235870B; GB201106353D0; DE102010027831A1

Abstract

A method is provided for determining a maximum possible speed of a vehicle within a remaining region LFBof a measurement section LABin order to avoid exceeding a maximum permissible speed within the measurement section LAB. The method comprises acquiring information, in particular: location information relating to the measurement section LAB; and/or a maximum permissible speed in the measurement section LAB; and/or a vehicle position F in the measurement section LAB; and/or a period of time tAFrequired for the vehicle to travel across the region LAF, notably from the start A of the measurement section LABto the vehicle position F within the measurement section LAB. Furthermore, the method comprises determining the maximum possible remaining region speed VFBfrom the information acquired, wherein, the maximum possible remaining region speed VFBrepresents a maximum speed at which the vehicle is allowed to travel, such that it travels across LFB, notably from the vehicle position F in the measurement section LABto the end B of the measurement section LABwithout exceeding the maximum permissible speed in the measurement section LAB. The method is particularly suited for use in Section-Control, Trajectcontrole and SPECS monitored regions.

Description

Descrtion Method and navation device for determining a maximum possible remaining section speed of a vehide The present invention re'ates to a method for determining a maximum possible remaining section speed of a vehide, a navigation device for performing the method and to a computer program product for carrying out the method on a navigation device.

The term "SectionControI" designates a system for monitoring speed Umits in road traffic, in which it is not the speed which is measured at a specific point but rather the average speed over a re'atively long section. This is performed with the aid of two overhead control points which are equipped with cameras.

A vehicle is photographed at both the first and second contro points. The vehide is identified by the vehicle registration plate by means of automatic number plate recognition. An average speed is determined by reason of the required time between the two contro' points. If it is above the permitted maximum speed, the data ascertained is reayed automatically to the aw enforcement personnel. The system described is afready being used successfuUy in Austria.

In the Netherands, there is a similar system (Trajectcontroe, section contro).

It photographs each vehicle by means of an infrared flash from the rear. The camera units are mounted on the rear side of illuminated speed limit signs. n the UK, a large number of speed measurements are also performed by means of section contro, in this case designated as SPECS. However, in contrast to other countries reference is made to speed measurement by means of normal systems of road signs and signals. Virtually all of the SPECS cameras are known, they are a'so named on official websites and accurately disp'ayed on maps. In most cases, the cameras are located in the midd'e of the road on traffic isands and are held by means of a buepainted mast above the respective traffic lanes. In Germany, the decision was made on the 47th German Traffic Court Day in Goslar to test SectionControl" in a federal state.

Owing to the considerabe success achieved with the systems, it is envisaged that further systems wifi foHow in the future.

For the sake of simpUcity, the term Section-Contro' wifi be used hereinafter.

However in essence this refers in aD cases to a system which corresponds to one of the aforementioned systems.

DE 10 2007 049 509 Al discoses a motor vehicle navigation system having a measuring device for measuring the vehicle speed, this is a processor device which is arranged to calculate the expected time of arrival such that a first average speed, based upon a previous time period, is determined, that based upon the first average speed at east one previous exclusion time period is determined, that a second average speed, based upon a previous time period, is determined, wherein at east the exc'usion time period is not taken into account, and that the expected time of arrival, based upon the second average speed, is determined.

Disdosure of the invention Against this background, the present invention presents a method, also a navigation device which uses this method, and finally a corresponding computer program product in accordance with the independent claims.

Advantageous embodiments are described in the respective subordinate

claims and the description hereinafter.

The present invention provides a method for determining a maximum possible remaining section speed of a vehicle to avoid the average speed being exceeded in a measurement section, which can comprise the steps of: readingin information reating to a measurement section (wherein this information relating to the measurement section can include in particular a start position and an end position and/or a ength of the measurement section), and/or a maximum permissib'e speed in the measurement section, and/or a vehicle position in the measurement section and/or a period of time required by the vehicle from entering the measurement section to reaching the vehicle position in the measurement section, wherein the reading-in procedure is performed in particular via a reading-in interface; -determining the maximum possible remaining section speed from S the information read-in, wherein the maximum possible remaining section speed represents a maximum speed at which the vehicle is aVowed to travel (at homogenous speed), so that it travels from the vehicle position to the end of the measurement section without exceeding the maximum permissible average speed in the measurement section; and -providing the determined maximum remaining section speed to an output interface.

The present invention also provides a navigation device which is designed to perform or implement the steps of the method in accordance with the invention. In particular, the navigation device can comprise devices which are designed to execute a respective step of the aforementioned method. The object of the invention can also be achieved quickly and efficiently by this embodiment variation of the invention in the form of a navigation device.

In the present case, a navigation device can be understood to be an electrical device which processes signals and in dependence thereon outputs control or output signals. The navigation device can comprise an interface which can be designed in terms of hardware and/or software. In the case of a hardware design, the interfaces can be e.g. part of a so-called system ASIC which includes a wide variety of functions of the navigation device. However, it is also possible for the interfaces to be dedicated, integrated circuits orto consist at least partially of discrete components. In the case of a software design, the interfaces can be software modules which are provided e.g. on a microcontroller along with other software modules.

Also advantageous is a computer program product with program code which is stored on a machine-readable medium such as a semiconductor memory, a hard disk storage unit or an optical storage device and is used for the purpose of performing the method in accordance with one of the abovedescribed embodiments when the program is executed on an navigation device.

Afternatively, the program code can also be provIded on a server for downloading via a data link, e.g. via the Internet. Upon payment of a fee, downloading can then be enabled by the operator of the server. The computer program product thus represents a commercial device whIch can be handled independently.

The present invention is based upon the knowledge that now a maximum remaining section speed can be determined which is related to the current position of the vehicle and which indicates the maximum speed at which the vehicle is aVowed to travel in order to be able to complete the remaining part of the journey in the measurement section without exceeding the maximum permissible average speed in the measurement section. The measurement section is defined as being a section in which a section control over the average travel speed of a vehicle is performed in this section. The maximum remaining speed is defined as being a maximum speed at which the vehicle is aVowed to travel without exceeding the prescribed maximum average speed in the measurement section.

The approach proposed above offers the advantage that now a driver can very easily be provided with an indication as to how fast he is aVowed to travel in the remaining part of the measurement section without facing the imposition of a ticket per Se. This significantly unburdens the driver as he no longer has to watch closely that the maximum permissible speed is observed at all times when travelling through the measurement section. On the contrary, the driver is also able to drive, in a part of the measurement section, faster than the maximum permissible average speed (e.g. for an overtaking manoeuvre) and can then drive more slowly in a subsequent part of the measurement section.

The invention presented in this case enables the driver to adhere as precisely as possible to the maximum permissible travelling speed and thus pass through the measurement section as fast as possible, which without the invention would be very much more difficult.

The maximum possib'e remaining section speed can be determined during the determining step such that it is not greater than the maximum permissible speed in the measurement section. Therefore, it is possib'e to encourage the vehide driver not to exceed the prescribed maximum speed.

In accordance with one particuar embodiment of the invention, the information relating to the measurement section and/or the maximum permissible speed in the measurement section can be taken in the reading-in step from stored map data and/or from an optical detectIon system and/or from other information sources, in particular radio-communication and/or USB.

As a consequence, it is possible to update the positions of the measurement sections and the speeds to be traveHed at thereon frequently, in particu'ar for different measurement sections, and to warn the vehide driver with a high degree of probabiUty about exceeding the maximum permissible speed.

In accordance with another embodiment of the invention, the vehicle position in the measurement section can be taken in the reading-in step from a sensor onboard the vehicle, in particular a navigation system and/or a speedometer and/or a whee' rotational speed sensor. The position can aso be detected via a sateflite-based navigation system. As a consequence, the average speed can aso be determined. This represents a technicafly simpe and also cost-effective so'ution, since the components required for this purpose are either already installed in the vehic'e or can be additionally installed in a very cost-effective manner.

In a particularly advantageous embodiment of the invention, the maximum possible remaining section speed can be determined in the determining step in accordance with the following equation:

_________

where LFB represents the ength of the section from the vehide position in the measurement section and the end of the measurement section, LAB represents the length of the measurement section, VABsofl represents the permissible average speed in the measurement section and tAF represents the time elapsed between the vehicle entering the measurement section and arriving at the vehicle position. ThIs type of variant for determining the maximum remaining section speed offers the advantage that by using a very simple equation, no large numeric resources need to be made avaable, which means that the determination of the maximum possible remaining speed can possibly be performed also on an already existing, powerful processor unit in the vehicle.

By way of example only, specific embodiments of the present invention will now be described, with reference to the accompanying drawings, in which: Figure 1 shows a block diagram of a first exemplified embodiment of the present invention; Figure 2 shows a schematic diagram of a section control and calculation bases in accordance with a further exemplified embodiment of the present invention; Figures 3a to c show a possible mode of illustrating the determined remaining section speed in accordance with a further exemplified embodiment of the present invention; Figures 4a to c show a further possible mode of illustrating the determined remaining section speed in accordance with a further exemplified embodiment of the present invention; and Figure 5 shows a flow chart of an exemplified embodiment of a method of the present invention.

Like or similar elements can be designated in the Figures by like or similar reference numerals, wherein the description is not repeated. Furthermore, the Figures of the drawings, the description thereof and the claims contain numerous features in combination. It is clear to a person skilled in the art that these features can also be considered indMdually or they can be combined to form further combinations which are not described explicitly in this case.

Furthermore, the invention is explained in the description hereinafter using different measurements and dimensions, wherein it Is to be understood that the invention is not limited to these measurements and dimensions.

Furthermore, method steps in accordance with the invention can be repeated and performed in a different sequence than that described. If an exemplified embodiment indudes an "and/or" link between a first feature/step and a second feature/step, then this can be read in such a way that in accordance with one embodiment the exemplified embodiment comprises both the first feature / the first step and also the second feature / the second step and in accordance with a further embodiment it comprises either only the first feature/step or only the second feature/step.

Many vehicle drivers drive essentiafly at the respectively permitted limit or just above this limit specifically so as not to be flashed if a speed trap is positioned at the roadside.

However, if such a vehicle drlver drives through a section which is equipped with Section-Control, he must pay more attention to his average speed than the speed at which he is currently driving.

There can always be situations, in which the driver is driving faster than the permitted speed, e.g. in order to carry out an overtaking manoeuvre efficiently or because he has simply forgotten that a speed limit applies. In such a moment, his average speed increases between two measurement points of a Section-Control system, but the driver has little chance to estimate by how many km/h it increases on account of the maximum permissible average speed being exceeded for a short time in this manner in this section control, and whether this will have consequences in relation to receiving a penalty notice. In theory, he could compensate for this increase by subsequently driving a little slower but he does not know how long and how slow he must drive in order to do this. As a consequence, the driver possibly encounters a stressful situation and he continues to drive either two slowly or at the specified maximum speed. In the tatter case, his vehide would be detected by SectionContro and he would have to expect a fine for exceeding the maximum speed.

In particuar, the aim of the approach proposed in this case is to inform the driver how high his current average speed is between two measurement points of a SectionControl system and to estabUsh a recommendation for a speed to be observed in order not to exceed the permitted average speed limit.

This kind of approach of a socalled Person SectionContro (PSC) system thus eads to the avoidance of stress at the driver's place of work or penafty notices for driving too fast in areas monitored by SectionControL It is a'so an important aspect of the present invention to have the Section-Contro measurement algorithm reproduced within a vehicle navigation system in the vehicle by means of the Personal SectionContro (PSC), in order a'ways to have up4o-date information during the vehicle's journey within the road section which is monitored by the section controL Figure 1 iflustrates a diagram of system components which in accordance with one exemplified embodiment of the present invention can be connected in an advantageous manner to a navigation device 100. A camera system 102, a navigation system and/or route calcu'ation system 104, a digital map base 106 and/or further data sources 108, such as USB, radiocommunication, Internet and others can use a readin interface of the navigation device 100 in order to transmit information for the purpose of determining a maximum remaining section speed. In this contro device 100, which can aso be designated as PSC (PSC = Persona' SectionControl), it is subsequently possible to determine from this data the maximum remaining section speed for the remaining section from the vehicle position to the end of the measurement section. The determined remaining section speed is then provided to an output interface of the navigation device 100 for a dispay system 110.

n accordance with one exempllfied embodiment of the invention, the vaues of the current average speed between Section-Contro' measurement points and the recommended speed can be determined in the PSC unit 100 on the basis of the navigation or route cacuation system, the digital map base and/or a camera system for identifying the traffic signs and/or optionally further sources, in order finally to output them in the disp'ay system for the driver.

n accordance with one exemplified embodiment of the invention, the measurement point locations and/or the permissib'e maximum speeds can already be provided in the data of the navigation system such as e.g. a digita' map base and/or can be fed into the navigation system from other data sources (e.g. via USB and/or by radio-communication). Furthermore, an intelligent camera which is mounted on the vehide can record and read out the electronic traffic signs and/orthe road signs indicating the speed Hmits, and feed the read-out data into the system for determining the maximum remaining section speed. The navigation system is aware of the current speed e.g. by reason of its sensor system (e.g. wheel rotationa' speed sensor etc.). The current system time is available in the navigation system. The "most probab'e path" is likewise availab'e, Figure 2 illustrates a schematic diagram of a section control with a definition of variab'es which can be used for the ca'culations in accordance with an exempufied embodiment of the present invention.

A vehicle passes, at time tA at a location A 216, the first measurement point 212 (which can also be defined as the measurement site), the beginning of the measurement section. The first measurement point A 212 consists of a vehicle recognition system and a light barrier. At the first measurement point 212 the speed llmit for the measurement section is displayed; 60 km/h in this examp'e. Upon passing the measurement point 212 the vehicle is registered at location A 216 with the aid of the vehicle recognition system. The time tA at which the vehicle passes the first measurement point 212 is determined with the aid of the fight barrier.

At time tF the vehicle is located in the measurement section at a ocation F 218 and is travelHng at speed VF. ft has already travefled the section LAF in the measurement section. The vehic'e must still trave the section LFB up to a location B 220 at which the second measurement point 214 and the end of the measurement section are ocated. Together LAF and LFB combine to form LAB, the tota' ength of the measurement section.

At time tB the vehicle passes at ocation B 220 the second measurement point 214, the end of the measurement section. The second measurement point B 214 consists of a vehicle recognition system and a Ught barrier. At the second measurement point 214 the speed limit for the further section is disp'ayed. n this examp'e, the speed limit of 60 km/h is cancelled. Upon passing the second measurement point 214, the vehide s registered at location B 220 with the aid of the vehicle recognition system. The time tB at which the vehide passes the second measurement point 214 is determined with the aid of the light barrier.

The necessary speed vpB between ocation F and ocation B is cacuIated from the section LFB between ocation F and ocation B and the remaining time tFB from ocation F to ocation B in accordance with the foflowing equation 1:

LFB 1FB

The remaining time tFB from F to B is determined from the desired time (Soll Zeit) tAB between A and B and the aready lapsed time tAF between A and F in accordance with the foflowing equation 2: t= t-t (2) The desired time tAB between A and B can be cacuated from the section LAB between A and B and the permissib'e maximum speed in accordance with the 1 1 following equation 3, wherein the permissible maximum speed corresponds at the same time to the permissible average speed: Le A-SoU Therefore, by substituting the equations into each other the necessary speed VFB between F and B can be calculated in accordance with the foHowing equation 4, in order not to have exceeded the permissible average speed upon arrival at location B:

AB-SOU

In this case, the variables which are used in the equation above designate the following relationships: A = location of the first measurement point 212, B = location of the second measurement point 216, F = current vehicle position, tAF = elapsed time between passing location A and arriving at the current vehicle position, tFB = remaining time between location F and location B, LAB = section between location A and location B, LAF = sections between location A and location F, VABo = current speed limit between the first measurement site 212 and the second measurement site 216; this corresponds in this case to the permissible average speed, vFB = necessary speed between location F and location B in order upon arrival at location B to have observed an average speed which is not higher than the speed limit in the (measurement) section.

Some rules for calculating the time since passing the first measurement point 212 are listed hereinafter.

At the moment when the vehicle passes the first measurement point 212, eg.

the current system time of the navigation system is stored. In order to calculate the time which has elapsed since this point in time, this stored time is subtracted from the respectively current system time. If the vehicle passes a further measurement point at the same maximum speed, then the stored time from the first measurement point is retained, as it is assumed that it is a "reminder sign".

If the vehicle passes a sign, on which the speed limit is cancefled, the determination of the maximum remaining section speed is reset in the navigation device 100 (PSC), as it is assumed that the section containing the speed limit has been passed through.

If the vehicle passes a point, at which the speed limit changes, then the measurement procedure starts anew.

Upon reaching the second measurement site 216 the result of the equation becomes unusable, as a theoretical equation of 0/0 is produced. This must be intercepted by corresponding algorithms for display purposes.

In accordance with an exemplified embodiment of the inventIon, the following information for example is required as input data for determining the maximum remaining section speed: locations of the SectionControl measurement points permissible maximum speed between the measurement points current speed at which the vehicle is being drIven current system time.

Figures 3a to c illustrate possible modes of illustrating a determined maximum remaining section speed in accordance with a further exemplified embodiment of the present invention.

A circle 322 is illustrated which represents a speedometer dIal having assigned speed marks for 100 km/h, 120 km/h, 140 km/h and 160 km/h. An arrow 324 representing the speedometer needle is also illustrated, An illustration of the maximum permitted average speed applicable in this exempHfied embodiment is iDustrated as a bold circle 326 with the marked speed limit of 120 km/h. A bold arrow 328 points to the speed which is recommended in this exempUfied embodiment and which corresponds to the determined maximum remaining section speed.

In the iflustration in accordance with Figure 3a, the average speed at which the vehicle has hitherto been driven in the measurement section is lower than the maximum permitted average speed in the measurement section.

Therefore, the arrow 328 points to the maximum speed of 140 km/h at which the vehicle can be driven wfthout exceeding the maximum permitted average speed in the measurement section.

In the illustration in accordance with Figure 3b, the average speed at which the vehicle has hitherto been driven in the measurement section corresponds precisely to the permissible average speed in the measurement section.

Therefore, the bold arrow is blanked out in this case.

In the illustration in accordance with Figure 3c, the average speed at which the vehicle has hitherto been driven in the measurement section is higher than permitted. Therefore, the arrow 328 points to the maximum speed of 100 km/h at which the vehicle can be driven without exceeding the maximum permitted average speed in the measurement section.

The described exemplified embodiment of the invention thus displays the speed limit and the recommended speed indicated on the speedometer. This exemplified embodiment is provided in particular for fixedly installed navigation systems, as they are typically also linked to the display instruments in the combi-display. Figure 3a, Figure 3b and Figure 3c illustrate examples of such a display. If the current average speed is lower than required, then a marker (in this case the arrow 328) indicates the recommended speed at which the driver can still drive without exceeding the speed limit on average.

For safety reasons and to ensure that the driver is not intentionally encouraged to drive too fast, the marker could also remain static at the speed limit for the permissible average speed in the measurement section. If the driver precisely observes the speed limit, then there is no reason to provide a recommendation and the marker is blanked out. However, if the driver drives too fast, the marker moves in the direction of lower speeds and indicates the speed which the vehicle should assume in order not to exceed the average speed.

A further exemplified embodiment of the invention functions in a similar manner to that previously described, however the existing segments of the speedometer display are used instead of additional markers. By marking the corresponding segment in colour (e.g. by using corresponding muRicoloured LEDs) the recommended speed is indicated to the driver. Therefore, elements of the display familiar to the driver are used, which promotes intuitive handling of the functionality.

In accordance with one exemplified embodiment of the invention, the invention includes the display of the average speed at which a vehicle is currently being driven between two measurement points of the Section Control system and the required speed at which the vehicle is to be driven in order still to reach the permitted average speed limit. The method also functions without inputting a destination, i.e. without active route guidance using the "most probable path".

Figures 4a to c illustrate further possible modes of illustrating a second item of information in accordance with a further exemplified embodlment of the present invention.

A bar 430 in the form of a bar chart display representing a speed range is illustrated. Furthermore, a marker 432 is illustrated which represents the speed at which a vehicle is driven. An illustration of the maximum permitted average speed applicable in this exemplified embodiment is represented as a bold circle with the marked speed limit of 120 km/h. A bold arrow 436 points to the speed which is recommended in this exemplified embodiment.

n the iflustration of Figure 4a, the average speed of 100 km/h at which the vehicle has hitherto been driven in the measurement section is bower than required. Therefore, the arrow 436 points to the maximum speed of 140 km/h at which the vehide can be driven without exceeding the maximum permitted average speed in the measurement section.

In the illustration of Figure 4b, the average speed at which the vehicle has hitherto been driven in the measurement section is precise'y correct.

Therefore, the bold arrow is b'anked out.

n the iflustration of Figure 4c, the average speed of 140 km/h at which the vehicle has hitherto been driven in the measurement section is higher than permitted. Therefore, the arrow 436 points to the maximum speed of 100 km/h at which the vehicle can stifl be driven without exceeding the maximum permitted average speed in the measurement section.

The described exempflfied embodiment of the invention thus illustrates the speed Umit and the recommended speed in a bar chart disp'ay. This embodiment is suitable for mobile navigation devices, since in general on'y the navigation dispay screen is availab'e in this case and correspondingly there is no access to the combi-dispay. Figures 4a to c iilustrate exampes of such a disp'ay. If the current average speed is sower than required, then a marker (in this case an arrow 436) indicates the recommended speed at which the driver can still drive without exceeding the speed Umit on average.

For safety reasons and to ensure that the driver is not intentionally encouraged to drive too fast, the marker 436 could also remain static on the speed limit. If the driver precisely observes the speed limit, then there is no reason to provide a recommendation and the marker is blanked out.

However, if the driver drives too fast, the marker moves in the direction of ower speeds and indicates the speed which the vehicle shoud assume in order not to exceed the average speed.

Exemplary appilcations for the present invention include in particular mobile or fixedly instafled vehicle navigation systems (e.g. for passenger vehicles, commercial vehicles, motorcycles).

Figure 5 illustrates a flow chart of an exemplifIed embodiment of the present invention as a method 500 for the purpose of determining a maximum possible remaining section speed of a vehicle so as to avoid exceeding the average speed in a measurement section. The method includes a step of reading-in 510 information, in particular location information, relating to the measurement section and/or a maximum permissible speed in the measurement section and/or a vehicle position in the measurement section and/or a period of time required by the vehicle from entering the measurement section to reaching the vehicle position in the measurement section, via at least one reading-in interface. Furthermore, the method 500 includes a step of determining 520 the maximum possible remaining section speed from the information read-in, wherein the maximum possible remaining section speed represents a maximum speed at which the vehicle is allowed to travel, so that it travels from the vehicle position in the measurement section to the end of the measurement section without exceeding the maximum permissible average speed in the measurement section. Finally, the method 500 includes a step of providing 530 the maximum remaining section speed to an output interface.

Claims

C'aims 1. A method for determining a maximum possibe remaining section speed of a vehic'e to avoid the average speed being exceeded in a measurement section, comprising the steps of: readingin information, in parflcuar ocation information, re'ating to the measurement section and/or a maximum permissib'e speed in the measurement section and/or a vehicJe position in the measurement section and/or a period of time required by the vehide from entering the measurement section to reaching the vehide position in the measurement section; and -determining the maximum possib'e remaining section speed from the information read-in, wherein the maximum possib'e remaining section speed represents a maximum speed at which the vehic'e is aVowed to trave', so that it trave's from the vehide position in the measurement section to the end of the measurement section without exceeding the maximum permissibe average speed in the measurement section.
2. A method as daimed in daim 1, wherein in the step of determining the maximum possibe remaining section speed is determined in such a manner that it is not greater than the maximum permissib'e speed in the measurement section.
3. A method as claimed in any one of the preceding claims, wherein in the step of reading-in the information re'ating to the measurement section and/or the maximum permissib'e speed in the measurement section is taken from stored map data.
4. A method as claimed in any one of the preceding claims, wherein in the step of reading-in the information re'ating to the measurement section and/or the maximum permissib'e speed in the measurement section is taken from an onboard optica' detection system.
5. A method as claimed in any one of the preceding claims, wherein in the step of readingin the information relating to the measurement section and/or the maximum permissible speed in the measurement section is taken from a ratho transmission and/or from a USB-based transmission.
6. A method as claimed in any one of the preceding claims, wherein in the step of readingin the vehicle position in the measurement section s read-n by a sensor onboard the vehicle, in particular a navigation system and/or a speedometer and/or a wheel rotational speed sensor,
7. A method as claimed in any one of the preceding claims, wherein in the step of determining the maximum possible remaining section speed is determined in accordance with the following equation: -1s5 bpB where LFB represents the length of the section from the vehicle position in the measurement section and the end of the measurement section, LAB represents the length of the measurement section, VABSOU represents the permissible average speed and tAF represents the time elapsed between the vehicle entering the measurement section and arriving at the vehicle position.
8. A method for determining a maximum possible remaining section speed of a vehicle to avoid the average speed being exceeded in a measurement section, substantially as herein described with reference to, and as illustrated in, the accompanying drawings.
9. A navigation device which is designed to perform the steps of a method as claimed in any one of claims I to 8.
10. A computer program product comprising program code which is stored in particular on a machinereadable medium, for carrying out the method as claimed lnanyoneofclalms I to8whenthe programisrunona navigation device.
II. A navigation device substantially as herein descdbed with reference to, and as Illustrated In, the accompanying drawinge.
12. A computer program product substantially as herein described with reference to, and as Illustrated In, the accompanying drawings,