CN109191844A - Traffic flow acquisition equipment and traffic control system - Google Patents
Traffic flow acquisition equipment and traffic control system Download PDFInfo
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- CN109191844A CN109191844A CN201811122979.4A CN201811122979A CN109191844A CN 109191844 A CN109191844 A CN 109191844A CN 201811122979 A CN201811122979 A CN 201811122979A CN 109191844 A CN109191844 A CN 109191844A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
- G08G1/0133—Traffic data processing for classifying traffic situation
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/095—Traffic lights
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Traffic Control Systems (AREA)
Abstract
Traffic flow acquisition equipment and traffic control system provided by the invention, the traffic flow acquisition equipment are set on traffic lights shell；The traffic flow acquisition equipment includes shell；Collector and controller are equipped in the shell, the shell is equipped with multiple spotlights；The controller is electrically connected with traffic light controller；The collector and spotlight are electrically connected with the controller respectively；The spotlight is disposed side by side on the shell of traffic flow acquisition equipment, and the light of spotlight projects on the stop line on road surface.The equipment is equipped with collector, can be used in the system using wireless technology monitoring vehicle flowrate, structure is simple, at low cost, the equipment is additionally provided with spotlight, the light of spotlight projects on the stop line on road surface, so that stop line is more eye-catching, plays driver's prompting function.
Description
Technical field
The invention belongs to big data technical fields, and in particular to traffic flow acquisition equipment and traffic control system.
Background technique
As increasingly science and the automobile of urban planning increase, vehicle flowrate data for urban road planning construction,
Automobile control, traffic administration etc., which have, to be widely applied, and is a very important reference data.
Currently, the detection technique of vehicle flowrate mainly has: ground induction coil, video images detection, microwave radar detection, infrared inspection
Survey, ultrasound examination etc..For more other methods, video images detection technology, application flexible, at low cost with installation and maintenance
The advantages that range is wide, expansibility is strong and traffic management information is comprehensive is answered in traffic surveillance and control system at home and abroad
With.In video images detection technology, several frequently seen detection method has: gray scale comparison method, background subtraction, frame difference method, edge
Detection method.
Above-mentioned several automobile video detection methods in practical application, it is generally necessary to set a video sensing area,
One or more hough transform areas (also referred to as detector) are drawn in this region, when automobile device after testing, by corresponding
Detection module calculates the speed of automobile, the parameters such as length.This detection method needs to carry out data to the image of bulk zone
Processing, calculates complexity, and the operand of server is larger；HD video is especially handled, it is higher to the hardware requirement of server.And
And the detector to be established of these detection methods is complicated for operation, and for the more demanding of operator, detector inaccuracy is arranged
If, measurement accuracy rate will be affected.This brings larger difficulty to the arrangement of system and maintenance.
Summary of the invention
For the defects in the prior art, the present invention provides traffic flow acquisition equipment, and structure is simple, at low cost.The present invention
A kind of traffic control system is also provided, vehicle flowrate can be quickly detected, is calculated simple.
In a first aspect, a kind of traffic flow acquisition equipment, the traffic flow acquisition equipment is set on traffic lights shell；It is described
Traffic flow acquisition equipment includes shell；Collector and controller are equipped in the shell, the shell is equipped with multiple spotlights；
The controller is electrically connected with traffic light controller；The collector and spotlight are electrically connected with the controller respectively
It connects；
The spotlight is disposed side by side on the shell of traffic flow acquisition equipment, and the light of spotlight projects road surface
On stop line.
Preferably, the shell is rectangle；The spotlight includes at least 8, wherein on each side of the shell
It is equipped with 2 spotlights side by side respectively.
Preferably, the shell is rectangle；The spotlight includes at least 16, distinguishes on each side of the shell
Equipped with 2 row's spotlights, every row's spotlight includes 2 spotlights；
Wherein underlying row spotlight is red light, and the light of red light projects on the stop line on the road surface；Position
Row's spotlight in top is amber light, and the light of amber light projects the position on road surface at a distance from stop line for safe distance
Place.
Preferably, the range of the safe distance is 15-30 meters.
Preferably, 4G communication module is equipped in the shell；The 4G communication module is used to carry out with patrol police's server is handed over
Communication；The collector supports bluetooth or RFID communication.
Second aspect, a kind of traffic control system, including traffic flow acquisition equipment described in first aspect, and be arranged in vapour
Identifier and onboard navigation system on vehicle；Identifier on automobile is separately connected the collector and automobile of traffic flow acquisition equipment
On onboard navigation system；
The controller of the traffic flow acquisition equipment executes following methods:
It is preset with vehicle flowrate parameter and detection time length；
When having detected that identifier is connected to collector, the state of the identifier is set for connection, records identifier
Connection Time；
Monitor the state of the identifier in real time, if the state of the identifier becomes to disconnect by connecting, vehicle flowrate parameter
Increase by 1；
When the Connection Time for the identifier for detecting record, which is less than current time, subtracts detection time length, vehicle flowrate ginseng
Number subtracts 1；
Vehicle flowrate parameter is uploaded in real time and hands over patrol police's server.
Preferably, the identifier and collector use Bluetooth communication；The controller of the traffic flow acquisition equipment is also held
Row following methods:
Default association section；
The traffic information for handing over the association section on patrol police's server is read by 4G communication module；The traffic information packet
Include the vehicle flowrate parameter and congestion information in the association section；
Traffic information is sent to the onboard navigation system for connecting the automobile of upper traffic flow acquisition equipment by bluetooth；
The onboard navigation system is used to broadcast the congestion information in the association section；It is also used to obtain the current position of automobile
Confidence breath and destination, and optimal path is planned according to current location information, destination and vehicle flowrate parameter；The vehicle
Carry the vehicle flowrate parameter that navigation system is used to show association section.
Preferably, the onboard navigation system is planned most according to current location information, destination and vehicle flowrate parameter
Good path specifically includes:
Onboard navigation system calculates the vehicle pass-through speed in the section according to vehicle flowrate parameter；
Onboard navigation system generates several alternative paths from current location information to destination, from alternative path
The most slow section of vehicle pass-through speed is selected, the vehicle pass-through speed for defining the section is transit time
Defining the most fast path of transit time is optimal path.
Preferably, the congestion information includes congestion status, congestion reason and congestion time.
Preferably, the controller of the traffic flow acquisition equipment also executes following methods:
Traffic lights adjustment instruction is generated according to vehicle flowrate parameter, traffic light controller is sent to, adjusts the passage of traffic lights
Time.
As shown from the above technical solution, traffic flow acquisition equipment provided by the invention is equipped with collector, can be used for utilizing nothing
Line technology monitors in the system of vehicle flowrate, and structure is simple, at low cost, which is additionally provided with spotlight, the light projection of spotlight
Onto the stop line on road surface, so that stop line is more eye-catching, driver's prompting function is played.
Traffic control system provided by the invention monitors vehicle flowrate using wireless communication technique, and algorithm is simple, can quickly examine
Measure vehicle flowrate.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is the structural schematic diagram for the traffic flow acquisition equipment that embodiment one provides.
Fig. 2 is the peripheral circuit diagram for the controller that embodiment two provides.
Fig. 3 is the circuit diagram for the photosensitive sensors that embodiment two provides.
Fig. 4 is the circuit diagram for the display that embodiment two provides.
Fig. 5 is the circuit diagram for the buzzer that embodiment two provides.
Fig. 6 is the system block diagram for the traffic control system that embodiment three provides.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be only used as example, and cannot be used as a limitation and limit protection model of the invention
It encloses.It should be noted that unless otherwise indicated, technical term or scientific term used in this application are should be belonging to the present invention
The ordinary meaning that field technical staff is understood.
Embodiment one:
A kind of traffic flow acquisition equipment, referring to Fig. 1, the traffic flow acquisition equipment is set on traffic lights shell；It is described
Traffic flow acquisition equipment includes shell 1；Collector and controller are equipped in the shell, the shell is equipped with multiple spotlights 2；
The controller is electrically connected with traffic light controller；The collector and spotlight 2 are electric with the controller respectively
Connection；
The spotlight 2 is disposed side by side on the shell 1 of traffic flow acquisition equipment, and the light of spotlight 2 projects road
On the stop line in face.
Specifically, the collector supports bluetooth or RFID communication.Traffic light controller is the control on existing traffic lights
Device processed.The spotlight can use existing spotlight.The traffic flow acquisition equipment is set on traffic lights shell, is not needed
Additional erection support, and traffic flow acquisition equipment is set on traffic lights shell, the stop line on more road surfaces can be covered,
Spotlight can be set in the multiple directions of equipment in this way, the light of spotlight is enabled to project the stopping on more road surfaces
On line.
In order to better cover whole stop line, spotlight is disposed side by side on the shell of traffic flow acquisition equipment, is made
Spotlight projects the light on road surface and is capable of forming a line.The quantity of spotlight is determined according to the length of stop line, is stopped
Only line is longer, and the spotlight quantity needed is more.According to the rule of traffic lights, project stop line spotlight can select it is red
Lamp cannot cross stop line with red line instruction driver when red light.
The traffic flow acquisition equipment has wireless communication function, can be used for the system using wireless technology monitoring vehicle flowrate
In, structure is simple, at low cost, which is additionally provided with spotlight, and the light of spotlight projects on the stop line on road surface, so that stopping
Only line is more eye-catching, plays driver's prompting function.
Preferably, the shell is rectangle；The spotlight includes at least 8, wherein on each side of the shell
It is equipped with 2 spotlights side by side respectively.
Specifically, since traffic lights are generally located on crossing, it is possible to spotlight is set on four sides of shell,
Red line can be projected on the stop line on the road surface of traffic lights four direction in this way.
Preferably, the shell is rectangle；The spotlight includes at least 16, distinguishes on each side of the shell
Equipped with 2 row's spotlights, every row's spotlight includes 2 spotlights；
Wherein underlying row spotlight is red light, and the light of red light projects on the stop line on the road surface；Position
Row's spotlight in top is amber light, and the light of amber light projects the position on road surface at a distance from stop line for safe distance
Place.The range of the safe distance is 15-30 meters.
Specifically, other than the red line of the projection one on stop line, can also near stop line (i.e. with stop line
Distance be safe distance position) projection yellow line can be with slow down by yellow line alerting drivers when red light.
The range of safe distance is by user's self-setting.
Preferably, 4G communication module is equipped in the shell；The 4G communication module is used to carry out with patrol police's server is handed over
Communication.
Specifically, which can also read the data for handing over patrol police's server, understand real-time road.
Embodiment two:
Embodiment two on the basis of example 1, increases the following contents:
Photosensitive sensors 3 are additionally provided in the shell, the photosensitive sensors are electrically connected with the controller；
One end of the photosensitive sensors connects the controller by inductance L3, and the other end of photosensitive sensors is by successively
Series capacitance C3 and inductance l1 connect positive supply.
Specifically, the peripheral circuit diagram of controller is as shown in Figure 2.J1 is interface in Fig. 3, and the photosensitive sensors insertion should
In interface.Photosensitive sensors are for the light intensity outside sensing chamber, to adjust the brightness of spotlight.
Preferably, referring to fig. 4, display screen, the model LCD12864 of the display screen are additionally provided on the shell；It is described
Display screen the 1st, 2,18,20 pins ground connection, the 3rd, 19 pins connect positive supply, the 5th, 6,7,8,9,10,11,12,13,14,15,
16,17 pins are respectively connected to the different port of the controller, and the 4th pin connects the sliding end of slide rheostat VR1, the cunning
The both ends of dynamic rheostat VR1 connect positive supply and ground respectively.
Specifically, display screen is used to show the working condition of the traffic flow acquisition equipment or the congestion in place section
Situation.
Preferably, referring to Fig. 5, buzzer U2 is additionally provided on the shell；The one end buzzer U2 ground connection, three poles of another termination
The collector of pipe Q2, the emitter of triode Q2 connect positive supply, and the base stage of triode Q2 connects the controller by resistance R3.
Specifically, buzzer plays the function of prompting or alarm.
Equipment provided by the embodiment of the present invention, to briefly describe, embodiment part does not refer to place, can refer to aforementioned set
Corresponding contents in standby embodiment.
Embodiment three:
Embodiment three provides a kind of traffic control system, referring to Fig. 6, including above-mentioned traffic flow acquisition equipment, and setting
Identifier and onboard navigation system on automobile；Identifier on automobile be separately connected traffic flow acquisition equipment collector and
Onboard navigation system on automobile；
The controller of the traffic flow acquisition equipment executes following methods:
It is preset with vehicle flowrate parameter and detection time length；
Specifically, detection time length can be half an hour or 1 hour.Vehicle flowrate parameter refers to half an hour or 1
Current automobile quantity in a hour.
When having detected that identifier is connected to its collector, the state of the identifier is set for connection, records identifier
Connection Time；
Monitor the state of the identifier in real time, if the state of the identifier becomes to disconnect by connecting, vehicle flowrate parameter
Increase by 1；
Specifically, which monitors vehicle flowrate using wireless technology.When vehicle is close to traffic flow acquisition equipment,
And when entering the communication distance of collector of traffic flow acquisition equipment, the identifier on vehicle can connect traffic flow acquisition equipment
Collector.After vehicle sails out of, identifier and the collector of traffic flow acquisition equipment just be will disconnect.When the state for having identifier
When becoming to disconnect by connection, illustrate that the vehicle sails out of again after traffic flow acquisition equipment, which passes through the crossing, leads to
Capable automobile quantity increases by 1.
The collector and identifier can support bluetooth or RFID communication.When using RFID communication, identifier RFID
Label, collector are RFID reader, and when vehicle is close to traffic flow acquisition equipment, collector can read identifier
Data.If when using Bluetooth communication, collector and identifier are bluetooth module, when vehicle is close to traffic flow acquisition equipment,
And identifier, when entering in the communication distance of collector, identifier can connect collector, carry out data transmission.Remember when detecting
When the Connection Time of the identifier of record subtracts detection time length less than current time, vehicle flowrate parameter subtracts 1；
Vehicle flowrate parameter is uploaded in real time and hands over patrol police's server.
Specifically, if monitoring detection time length is 1 hour, vehicle flowrate parameter is current in monitoring 1 hour
Automobile quantity.If the linkage record of identifier is more than 1 hour, the record of the vehicle is deleted, the system can be in real time in this way
Record vehicle fleet size current in nearly 1 hour.The system monitors vehicle flowrate using wireless technology, and algorithm is simple, can quickly examine
Measure vehicle flowrate.
In addition to this, which also provides the function of guidance path selection.The identifier and collector are logical using bluetooth
Letter；The controller of the traffic flow acquisition equipment also executes following methods:
Default association section；
Specifically, association section is road or the section near traffic flow acquisition equipment, such as: the road within 1~3 kilometer
Road.After associated road, the jam situation in association section can be checked.
The traffic information for handing over the association section on patrol police's server is read by 4G communication module；The traffic information packet
Include the vehicle flowrate parameter and congestion information in the association section；
Specifically, traffic information is actively uploaded to and hands over patrol police's server by each section.Patrol police's server is handed over to be stored with each
The jam situation in section.Such as: the association section of section A is section B, section C and section D, then when having vehicle by section
A, and when the traffic flow acquisition equipment of the upper section A of connection, read the road conditions for handing over section B, section C and section D on patrol police's server
Information.
Traffic information is sent to the onboard navigation system for connecting the automobile of upper traffic flow acquisition equipment by bluetooth；
The onboard navigation system is used to broadcast the congestion information in the association section；It is also used to obtain the current position of automobile
Confidence breath and destination, and optimal path is planned according to current location information, destination and vehicle flowrate parameter；The vehicle
Carry the vehicle flowrate parameter that navigation system is used to show association section.
Specifically, the traffic information of the road near the available current location of onboard navigation system, and according to neighbouring
Traffic information cooks up optimal path.Such as in above-mentioned example: assuming that destination is sight spot A, starting point is house A, when vehicle is sailed
When entering section A, onboard navigation system can directly obtain the traffic information of section B, section C and section D in current 1 hour,
Assuming that the navigation routine of original onboard navigation system is the section the house A- section the A- sight spot B- A.If in current 1 hour, from
Analysis obtains the vehicle flowrate maximum of section B in this 3 roads, and passage speed is most slow, in the transit time time of section C, section D's
Transit time is most short, then navigates and plan new route again: the section the house A- section the A- sight spot D- A.The onboard navigation system is also
The vehicle flowrate parameter that can show association section can directly show the section (i.e. association section) near current location in this way
Vehicle flowrate parameter, such user can also be directly viewable the vehicle flowrate parameter in association section, can be by digital intuitive accurate
The jam situation of road is known on ground, and voluntarily selects driving path.
During above-mentioned navigation path planning, the onboard navigation system according to current location information, destination with
And vehicle flowrate parameter planning optimal path specifically includes:
Onboard navigation system calculates the vehicle pass-through speed in the section according to vehicle flowrate parameter；
Specifically, jam situation is concluded with vehicle pass-through speed, this is because some section lanes are more, even if vehicle flowrate
Greatly, vehicle pass-through speed is also not necessarily slow.Some section lanes are few, even if vehicle flowrate is small, vehicle pass-through speed is also not necessarily fast,
So needing the traffic lights information on comprehensive section, the lane information in section and information of vehicle flowrate etc., the vehicle for calculating section is logical
Scanning frequency degree.
Onboard navigation system generates several alternative paths from current location information to destination, from alternative path
The most slow section of vehicle pass-through speed is selected, the vehicle pass-through speed for defining the section is transit time
Specifically, even on same section, can also there are individual segments and block up, individual segments do not block up, so true
It when the vehicle pass-through speed in the fixed section, is determined by the most slow segment of vehicle pass-through speed in section, i.e., the vehicle of the segment is logical
Influence of the scanning frequency degree to the communication speed in the section is maximum.
Defining the most fast path of transit time is optimal path.
Preferably, the congestion information includes congestion status, congestion reason and congestion time.
Specifically, congestion status include congestion, it is jogging, unimpeded, congestion is further divided into level-one congestion, second level congestion or three
Grade congestion etc., higher grade, and speed is slower.Congestion reason and congestion time are by handing over patrol police's platform to upload best friend patrol police's server
In, congestion reason includes traffic accident, constructs, changes road etc., since driver tends not to know when congestion in existing navigation
The reason of road congestion ahead, so most fast path cannot accurately be selected.The system can broadcast the association of current location
The congestion reason in section and time, help driver judge it is subsequent may can also congestion how long, if need to change other roads
It is current.
Preferably, the controller of the traffic flow acquisition equipment also executes following methods:
Traffic lights adjustment instruction is generated according to vehicle flowrate parameter, traffic light controller is sent to, adjusts the passage of traffic lights
Time.
Specifically, which can also be associated with traffic system, according to the jam situation in section, adjust in traffic lights red light and
The time of green light improves the respond of traffic condition.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (10)
1. a kind of traffic flow acquisition equipment, which is characterized in that the traffic flow acquisition equipment is set on traffic lights shell；It is described
Traffic flow acquisition equipment includes shell；Collector and controller are equipped in the shell, the shell is equipped with multiple spotlights；
The controller is electrically connected with traffic light controller；The collector and spotlight are electrically connected with the controller respectively；
The spotlight is disposed side by side on the shell of traffic flow acquisition equipment, and the light of spotlight projects the stopping on road surface
On line.
2. traffic flow acquisition equipment according to claim 1, which is characterized in that
The shell is rectangle；The spotlight includes at least 8, wherein being equipped with side by side respectively on each side of the shell
2 spotlights.
3. traffic flow acquisition equipment according to claim 1, which is characterized in that
The shell is rectangle；The spotlight includes at least 16, is respectively equipped with 2 row's optically focused on each side of the shell
Lamp, every row's spotlight include 2 spotlights；
Wherein underlying row spotlight is red light, and the light of red light projects on the stop line on the road surface；Positioned at upper
One row's spotlight of side is amber light, and the light of amber light projects on road surface at a distance from stop line at for the position of safe distance.
4. traffic flow acquisition equipment according to claim 3, which is characterized in that
The range of the safe distance is 15-30 meters.
5. traffic flow acquisition equipment according to claim 1, which is characterized in that
4G communication module is equipped in the shell；The 4G communication module is used to communicate with patrol police's server is handed over；It is described to adopt
Storage supports bluetooth or RFID communication.
6. a kind of traffic control system, which is characterized in that exist including traffic flow acquisition equipment described in claim 1, and setting
Identifier and onboard navigation system on automobile；Identifier on automobile is separately connected the collector and vapour of traffic flow acquisition equipment
Onboard navigation system on vehicle；
The controller of the traffic flow acquisition equipment executes following methods:
It is preset with vehicle flowrate parameter and detection time length；
When having detected that identifier is connected to collector, the state of the identifier is set for connection, records the connection of identifier
Time；
Monitor the state of the identifier in real time, if the state of the identifier becomes to disconnect by connecting, vehicle flowrate parameter increases
1；
When the Connection Time for the identifier for detecting record, which is less than current time, subtracts detection time length, vehicle flowrate parameter subtracts
Go 1；
Vehicle flowrate parameter is uploaded in real time and hands over patrol police's server.
7. traffic control system according to claim 6, which is characterized in that
The identifier and collector use Bluetooth communication；The controller of the traffic flow acquisition equipment also executes following methods:
Default association section；
The traffic information for handing over the association section on patrol police's server is read by 4G communication module；The traffic information includes institute
State the vehicle flowrate parameter and congestion information in association section；
Traffic information is sent to the onboard navigation system for connecting the automobile of upper traffic flow acquisition equipment by bluetooth；
The onboard navigation system is used to broadcast the congestion information in the association section；It is also used to obtain the current position letter of automobile
Breath and destination, and optimal path is planned according to current location information, destination and vehicle flowrate parameter；It is described vehicle-mounted to lead
Boat system is used to show the vehicle flowrate parameter in association section.
8. traffic control system according to claim 7, which is characterized in that the onboard navigation system is according to current position
Information, destination and vehicle flowrate parameter planning optimal path specifically include:
Onboard navigation system calculates the vehicle pass-through speed in the section according to vehicle flowrate parameter；
Onboard navigation system generates several alternative paths from current location information to destination, selects from alternative path
The most slow section of vehicle pass-through speed, the vehicle pass-through speed for defining the section is that transit time defines the most fast road of transit time
Diameter is optimal path.
9. traffic control system according to claim 7, which is characterized in that
The congestion information includes congestion status, congestion reason and congestion time.
10. traffic control system according to claim 6, which is characterized in that
The controller of the traffic flow acquisition equipment also executes following methods:
Traffic lights adjustment instruction is generated according to vehicle flowrate parameter, traffic light controller is sent to, adjusts the transit time of traffic lights.
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| CN107085953A (en) * | 2017-06-06 | 2017-08-22 | 郑州云海信息技术有限公司 | A kind of Intelligent traffic management systems and method based on cloud computing |
| CN108022328A (en) * | 2017-12-25 | 2018-05-11 | 重庆冀繁科技发展有限公司 | Vehicular satellite positions Tachographs terminal |
| CN207778282U (en) * | 2018-01-13 | 2018-08-28 | 钟丽艳 | A kind of intelligent transportation instruction street lamp |
| CN208805920U (en) * | 2018-09-26 | 2019-04-30 | 北京物宝技术有限公司 | Traffic flow acquisition equipment |
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