CN102587237B - Right-turning lane design method by considering turning characteristic of large vehicle - Google Patents
Right-turning lane design method by considering turning characteristic of large vehicle Download PDFInfo
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- CN102587237B CN102587237B CN201210094324.7A CN201210094324A CN102587237B CN 102587237 B CN102587237 B CN 102587237B CN 201210094324 A CN201210094324 A CN 201210094324A CN 102587237 B CN102587237 B CN 102587237B
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Abstract
The invention belongs to the field of traffic safety designs and lane designs. Aiming at the maximum sweeping path width and a difference of a radius between front inner wheels and a radius between rear inner wheels during right turning of a large vehicle, the invention provides a right-turning lane design method by considering a turning characteristic of the large vehicle. Compared with the conventional design method, the design method has the advantage that the safety, the efficiency and the land utilization are improved greatly. According to the technical scheme, the right-turning lane design method by considering the turning characteristic of the large vehicle comprises the following step of: calculating deflection of traces of a dragging articulated vehicle and a small coach, wherein (1) the width of a diversion lane is required to be equal to a sum of a wheel trace inner displacement, namely the maximum sweeping path width, and a lateral clearance, and (2) the right-turning trace of the large vehicle is fit by an asymmetric three-center composite curve with a relatively small curve radius of an entrance lane and a relatively large curve radius of an exit lane; and under the condition that the width of the diversion lane and an inner-arc radius are known, drawing the three-center composite curve of a right-turning lane. The method is mainly applied to lane design.
Description
Technical field
The invention belongs to Design of Traffic Safety, road design field, be specifically related to consider the right-turn lane method for designing of large car turning performance.
Background technology
In intersections planning and design process, the laying of right-turn lane is directly connected to the land scale of intersection and the efficiency of traffic circulation and safety.Considering on the basis of traffic composition, for urban road intersection, in existing " Intersection at Grade of Urban Road planning and design discipline ", selecting length to be 5 meters wide is that to be 12 meters wide be that the large car two class vehicles of 2.5 meters are Design vehicle for compact car and the length of 1.8 meters, and for highway crossing, in existing " specification of the highway route design ", select overall length be 6 meters, wide be the minibus of 1.8 meters, it is that to be 16 meters wide be that the saddle train 3 class vehicles of 2.5 meters are design vehicle for the truck of 2.5 meters and overall length that overall length is 12 meters wide.On port road, in traffic composition taking the oversize vehicle with two standard container or a large container as main vehicle, the length of wagon of this vehicle is about 16 meters, has three axles, four axles and five axle several types, and wherein five axle elongate containers vehicle proportions are larger.Therefore,, in Port Road and intersection design, should consider that its common gabarite as shown in Figure 1 using five these class standard trucks of axle elongate containers vehicle as design vehicle.
Oversize vehicle easily produces off tracking in turning process, as shown in Figure 2.The description of off tracking has two modes: one is stable state off tracking amount, and it is defined as vehicle in low speed turning process, the radial deflection of the generation between automobile front-axle center line and rear axis of spindle; Another kind is to scan path width, and it is defined as the path difference between front outer traction tire and rear interior trailer tire.The significant variable that another one is described large car turning performance is exactly that interior wheel is poor, it refers to the poor of the interior nose-wheel turn radius of Ackermann steer angle and inner rear wheel turning radius, for five axle elongate containers vehicles, be the poor of the interior front-wheel of tractor and the inner rear wheel turning radius of trailer.Generally speaking, vehicle body is longer, and the interior wheel of formation is poor just larger, scans path width and also can expand thereupon.
Take turns poor existence due to interior, oversize vehicle is in the time turning, and the driving trace of forward and backward wheel does not overlap, and forms larger corner between front of the car and rear vehicle body, very easily forms driver's " vision dead zone ".For example, if large car driver only notices that in right-hand bend process front-wheel can be by forgetting the interior poor existence of taking turns, just may cause rear interior wheel roll road surface away from or bump with bicycle and pedestrian that wait is walked, cause traffic accident.
In Plane Curve Design of Roads, need to consider stable state off tracking and interior foreign steamer extent.But, in the application in practice in China's road and traffic design field, for the design of right-turn lane, adopt in most cases simple holocentric circle compound curve (accompanying drawing 3-A), under rare occasion, can adopt three-core circle compound curve (accompanying drawing 3-B) to simulate the driving trace of right-hand bend vehicle, the Curve Design of the road kerb of turning right.The method of holocentric circle compound curve has length of tangent line, easily grasps and practical feature, can meet the designing requirement of urban road minibus, but but be difficult to adapt to for Port Road multiaxis large car.The right-turn lane design that adopts this method for designing to carry out large car often easily causes turning radius (holocentric radius of circle) deficiency or the excessive two kinds of adverse consequences of turning radius: excessive intersection land used waste, the phenomenon of easily bringing out the random parking in corner, intersection of causing of turning radius; Turning radius deficiency can reduce the ride comfort that cart travels, and increases traffic delay, even occurs disturbing the situation of turnover stomatodeum adjacent lane wagon flow.Equally, also there is similar problem in three-core circle compound curve method for designing.
Therefore, in the Design of Traffic Safety of Port Road intersection, be necessary to consider that the turning performance of oversize vehicle carries out the design of right-turn lane, can ensure on the one hand and reduce the interference to adjacent lane wagon flow by the ride comfort that large car is turned, improve traffic efficiency; Can avoid on the other hand large car to press road kerb phenomenon, reduce traffic accident, improve traffic safety.
Summary of the invention
The present invention is intended to solution and overcomes the deficiencies in the prior art, for the maximum occurring in oversize vehicle right-hand bend process scan path width and interior take turns poor, a kind of right-turn lane method for designing of considering large car turning performance is provided, utilizes three aspects: and traditional design method to have larger improvement in safety, efficiency and soil.For achieving the above object, the technical scheme that the present invention takes is that the right-turn lane method for designing of consideration large car turning performance, comprises the following steps:
Calculate traction towed vehicle, minibus wheel trace displacement;
For multiaxis large car, the method that adopts measured data and trace simulation to combine is estimated to comprise that maximum is scanned path width, maximum is taken turns trace displacement and the poor turning parameter of interior foreign steamer: first utilize the track extraction software based on video to retouch out front axle center and rear shaft center's trajectory, make the radial line of two geometric locuses along the whole length of geometric locus, in these radial line, find out maximum radial distance, the maximum radial distance that maximum course deviation equals actual measurement deducts the wide half of trailer rear axle; Then, utilize track of vehicle simulation softward Autoturn standard truck to be carried out under different turning radius to the turning modeling experiment of 90 degree, show that the maximum under various conditions is scanned path width, maximum wheel trace displacement and the poor design parameters of interior foreign steamer; Finally, utilize the measured data obtaining based on video to check the design parameters data based on turning modeling experiment, determine last turning parameter;
Turning parameter based on above, designs turning roadway by the following method:
(1) should to equal off tracking be that maximum is scanned path width and lateral clearance sum to the width on water conservancy diversion road;
(2) large car right-hand bend track carries out matching by an asymmetrical three-core circle compound curve that entrance driveway sweep is less, exit ramp sweep is larger;
(3) lead under flow path width and interior radius of curvature condition given, the three-core circle compound curve of right-turn lane draws step:
1), according to design vehicle type, draw the turning radius R in road outside
0, the center of circle is O
0;
3), according to the design right-turn lane width w of design vehicle, be offset out the turning radius R of road inner side
i, the concyclic heart of turning radius in interior outside;
4) the radius length R of easement curve
1, R
2, depend on the turning radius of road inner side, for the n of the turning radius of road inner side doubly, n value is 3-4;
5) respectively with O
0for the center of circle, R
1-R
1, R
2-R
ifor radius is drawn circular arc, the distance of circular arc and road inner side is R
1the intersection point O of parallel lines
1, be the center of circle of easement curve 1, the distance of circular arc and another road inner side is R
2the intersection point O of parallel lines
2, be the center of circle of easement curve 2;
6) connect O
0o
1, O
0o
2and the intersection point of extension and road inside cord is respectively B
1, B
2;
7) respectively with O
1, O
2for the center of circle, R
1, R
2for radius is drawn circular arc, the arc A obtaining
1b
1, A
2b
2be easement curve 1 and easement curve 2, A
1, A
2be respectively arc A
1b
1, A
2b
2the contact of linking-up road inner side.
Described calculating traction towed vehicle, minibus wheel trace displacement are that, for traction towed vehicle, wheel trace displacement refers to the ultimate range of axis to rear axle; For minibus, it is taken turns trace displacement and calculates in order to lower Pythagorean theorem formula:
In formula: the distance between l=diaxon, the m of unit; R=sweep, the m of unit;
If calculating wheel trace displacement is negative value, illustrate that wheelmark is offset to center of curve; If l < < is R, design formulas is reduced to-0.5 (l
2/ R)
Technical characterstic of the present invention and effect:
(1) taking measured data as basis, first obtain the maximum wheelmark deviant of oversize vehicle, maximum is scanned path and maximum wheel trace displacement and occurs in the same position of turn inside diameter, the maximum that adopts the method for estimating to obtain the actual travel of oversize vehicle scan path width and interior take turns poor;
(2) take the method for simulation, utilize Autoturn software oversize vehicle to be carried out under different turning radius to the right-hand bend modeling experiment of 90 degree, the maximum that obtains large car under different turning radius scan path width and interior take turns poor;
(3) measured data combines with experimental simulation data, determines the design parameters that under different turning radius conditions, camber line in flow path width and asymmetric three-core circle is led in large car right-hand bend, instructs on this basis the design of right-turn lane;
(4) the method evaluation novel design method of employing simulation modeling, can verify that from simulation result right-turn lane method for designing that the present invention proposes is compared with traditional design method, aspect efficiency, intersection delay is suitable, and increase the ride performance of large car at traffic safety, the traffic conflict of minimizing and other lane flows, and can save occupation of land.
Brief description of the drawings
Fig. 1 is port of the present invention district and Logistics Park standard truck size schematic diagram.
Fig. 2 is that large car wheel trace displacement of the present invention, maximum are scanned path width and the interior differential intention of taking turns.
Fig. 3 is method for designing traditional and right-turn lane the present invention's proposition.In figure, A. holocentric circle compound curve, B. three-core circle compound curve, asymmetric three center of circle compound curves of C..
Fig. 4 is the actual wheelpath extracting method of the large car based on video analysis software proposing in the present invention.
Fig. 5 turns right to lead flow path width and the maximum schematic diagram that is related to of path width and lateral clearance that scans.
Fig. 6 be the present invention propose lead flow path width and interior radius of curvature known conditions infradextroversion sweep is made workflow graph.In figure,
1) direction that track flows into is along X ' YX, and D ' CD is right side, track road kerb;
2), according to design vehicle type, draw the turning radius in road outside;
3), according to the design right-turn lane width w of design vehicle, be offset out the turning radius of road inner side, the concyclic heart of turning radius in interior outside;
4) the radius length R of easement curve
1, R
2, depend on the turning radius R of road inner side
i, general value is R
i3-4 doubly.
Fig. 7 is that to make workflow graph continuous for the present invention lead flow path width and the interior radius of curvature known conditions infradextroversion sweep that propose.In figure,
5) respectively with O
0for the center of circle, R
1-R
i, R
2-R
ifor radius is drawn circular arc, the intersection point O of the parallel lines of circular arc and D ' C (distance is R1)
1, be the center of circle of easement curve 1, (distance is R to the parallel lines of circular arc and DC
2) intersection point O
2, be the center of circle of easement curve 2;
6) connect O
0o
1, O
0o
2and the intersection point of extension and road inside cord is respectively B
1, B
2;
7) respectively with O
1, O
2for the center of circle, R
1, R
2for radius is drawn circular arc, the arc A obtaining
1b
1, A
2b
2be easement curve 1 and easement curve 2.
Fig. 8 is concrete enforcement technology path of the present invention.
Fig. 9 is that in embodiment 1, maximum course deviation and the maximum based on measured data scanned path width.
Figure 10 is the simulation evaluation modeling design sketch in embodiment 1.
Figure 11 is that novel design method and traditional design method are being used comparison (example 1) on the ground.
Detailed description of the invention
The present invention is directed to the maximum occurring in oversize vehicle right-hand bend process scan path width and interior take turns poor, propose a kind of right-turn lane method for designing of considering large car turning performance, and utilize three aspects: to compare the difference of novel design method and traditional design method from safety, efficiency and soil.This new method for designing mainly comprises the content of three aspects: the interior camber line design of asymmetric three-core circle right-hand bend that flow path width is determined, the interior wheel of consideration is poor, the given integrated geometric construction flow process in right-turn lane of leading under flow path width and interior radius of curvature condition are led in the right-hand rotation of scanning path width based on maximum.The evaluation method of considering the right-turn lane method for designing of large car right-hand bend characteristic comprises three aspects: (1) utilizes VISSIM to set up Traffic Flow Simulation Models, the traffic delay in relatively right-hand bend process; (2), based on VISSIM model, utilize Traffic Safety Analysis software SSAM to compare the traffic conflict in large car right-hand bend process; (3) utilize the track difference of AutoTurn software simulation standard truck under different designs method, relatively the land utilization efficiency of different designs method.
Calculating when off tracking, can using formula calculate adjacent shaft to or adjacent interface point between distance, square being directly proportional of wheelmark deviant and this distance.Therefore,, for great majority traction towed vehicle, wheel trace displacement refers to the ultimate range of axis to rear axle.For minibus, it is taken turns trace displacement and calculates in order to lower Pythagorean theorem formula:
In formula: the distance between l=diaxon, m; R=sweep, m;
If calculating wheel trace displacement is negative value, illustrate that wheelmark is offset to center of curve; If l < < is R, design formulas can be reduced to-0.5 (l
2/ R).
For multiaxis large car, the method that the present invention adopts measured data and trace simulation to combine is estimated each turning parameter: first utilize the track extraction software based on video to retouch out front axle center and rear shaft center's trajectory, make the radial line (as shown in Figure 4) of two geometric locuses along the whole length of geometric locus, in these radial line, find out maximum radial distance, the maximum radial distance that maximum course deviation equals actual measurement deducts the wide half of trailer rear axle; Then, utilize track of vehicle simulation softward Autoturn standard truck to be carried out under different turning radius to the turning modeling experiment of 90 degree, show that maximum under various conditions scans the design parameterss such as path width, maximum wheel trace displacement and interior foreign steamer be poor; Finally, utilize measured data to check track analogue data, determine last design parameters.Based on above design parameters, design by the following method turning roadway:
(1) width on water conservancy diversion road should equal off tracking (maximum is scanned path width) and lateral clearance sum, as shown in Figure 5.
(2) large car right-hand bend track can carry out matching by an asymmetrical three-core circle compound curve that entrance driveway sweep is less, exit ramp sweep is larger.
(3) lead under flow path width and interior radius of curvature condition given, the three-core circle compound curve of right-turn lane can draw according to the illustrated step in Fig. 6-7.
Below in conjunction with accompanying drawing 8, embodiments of the invention are elaborated: first carry out the collection of video data for the more intersection of harbour large car, secondly determine the highest large car type of ratio, as type design vehicle, then by video analysis software, the wheelpath of type design vehicle is extracted to (time precision 0.1 second respectively, 0.5 meter of spatial accuracy), with the modeling experiment of turning right by Autoturn, the maximum obtaining under different condition is scanned path width and the interior design parameterss such as difference of taking turns, finally carry out the matching of asymmetric three-core circle compound curve based on these parameters.
The present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1: right-turn lane of the present invention method for designing is for the Design of Traffic Safety of one typical intersection right-turn lane, Mou Gang district.By analyzing Gai Gang district oversize vehicle vehicle composition, elongate containers vehicle shared ratio in this intersection traffic forms all reaches more than 60%, the overwhelming majority is all elongate containers vehicle, and therefore in the Design of Traffic Safety of right-turn lane, Gang district, adopting elongate containers vehicle is type design vehicle.
In track leaching process, choose 15 satisfactory samples, finally obtain maximum course deviation and the maximum distribution map that scan path width of type design vehicle under same link condition, identical turning radius, see accompanying drawing 9.Utilize Autoturn software type design vehicle to be carried out under different turning radius to the turning modeling experiment of 90 degree, choose respectively 15 meters, 20 meters, 25 meters and 30 meters of turning radius and carry out simulated experiment, obtain the experimental result in table 1.
The lower maximum of the different turning radius of table 1 type design vehicle (R) scan path wide and interior take turns poor
| Maximum is scanned path width/m | Inside take turns poor/m | |
| R＝15 | 4.48 | 1.98 |
| R＝20 | 3.95 | 1.45 |
| R＝25 | 3.62 | 1.12 |
| R＝30 | 3.42 | 0.92 |
By reference to the accompanying drawings 9 and table 1 in result determine respectively the design parameters under flow path width and two kinds of methods for designing (the asymmetric three-core circle compound curve that traditional symmetrical three-core circle compound curve and the present invention propose) of leading of different turning radius in the design of Gai Gang district right-turn lane, as shown in table 2 and table 3.
Design size when 90 degree of table 2 type design vehicle under different turning radius conditions are turned
Table 3 type design vehicle is led flow path width
Choosing turning radius is that simulation modeling is carried out in 25 meters of right-hand rotations under condition, and now corresponding right-turn lane width is 5.0 meters, utilizes microscopic simulation software VISSIM to carry out simulation modeling.Entrance driveway in simulation modeling is three tracks (1 direct lane+1, left turn lane+1 right-turn lanes), the input parameter using the data in table 4 as simulation modeling, and simulated effect is shown in shown in accompanying drawing 10.Utilize the information such as car speed, track of VISSIM simulation data, by the turn right traffic conflict analysis of car of Traffic Safety Analysis software SSAM.
Table 4VISSIM simulation modeling input parameter
| Flow | Left-hand rotation ratio | Craspedodrome ratio | Right-hand rotation ratio | Cart ratio |
| 1973veh/h | 0.06 | 0.46 | 0.48 | 98％ |
The simulation result finally obtaining is as shown in table 5, can find out that the right-hand rotation car of two kinds of methods for designing is all incured loss through delay quite; Compared with conventional method, right-hand rotation cart in novel design method and the Serious conflicts of straight line vehicle greatly reduce, improve traffic safety, and indirectly shown to reduce the probability (reducing 61.43%) that takies same entrance driveway straight line track when right-hand rotation cart is turned.
Table 5 is incured loss through delay and traffic conflict evaluation result
(note: in SSAM analyzes, TTC (Time To Colision) value is less than 1.5 seconds thinks that traffic conflict occurs)
Figure 11 taking turning radius the design parameters during as 15 meters as reference, holocentric circle compound curve, symmetrical three-core circle compound curve and the comparison of three kinds of methods for designing of asymmetric three-core circle compound curve in floor space are carried out, can find out that method that the present invention proposes more presses close to the right-hand bend track of large car, respectively than holocentric circle and symmetrical three-core circle method saving soil 108.8m
2and 13.4m
2.
The outstanding characteristic that the right-turn lane method for designing of the consideration large car turning performance that the present invention proposes is turned right for oversize vehicle is determined the width on right-hand bend water conservancy diversion road, and adopt in asymmetric three-core circle the camber line road kerb curve of turning right to design, the complete workflow graph of doing is provided simultaneously.New method for designing can improve the ride performance of right-hand bend vehicle, improves traffic safety, saves the area.
Claims (2)
1. a right-turn lane method for designing of considering large car turning performance, is characterized in that, comprises the following steps:
Calculate traction towed vehicle, minibus wheel trace displacement;
For standard truck, the method that adopts measured data and trace simulation to combine is estimated to comprise that maximum is scanned path width, maximum is taken turns trace displacement and the poor turning parameter of interior foreign steamer: first utilize the track extraction software based on video to retouch out front axle center and rear shaft center's geometric locus, make the radial line of two geometric locuses along the whole length of geometric locus, in these radial line, find out maximum radial distance, the maximum radial distance that maximum wheel trace displacement equals actual measurement deducts the wide half of trailer rear axle; Then, utilize track of vehicle simulation softward Autoturn standard truck to be carried out under different turning radius to the turning modeling experiment of 90 degree, show that the maximum under various conditions is scanned path width, maximum wheel trace displacement and the poor design parameters of interior foreign steamer; Finally, utilize the measured data obtaining based on video to check the design parameters data based on turning modeling experiment, determine last turning parameter;
Turning parameter based on above, designs turning roadway by the following method:
(1) right-turn lane width should equal maximum and scans path width and lateral clearance sum;
(2) large car right-hand bend track carries out matching by an asymmetrical three-core circle compound curve that entrance driveway sweep is less, exit ramp sweep is larger;
(3), under given right-turn lane width and interior radius of curvature condition, the three-core circle compound curve of right-turn lane draws step:
1), according to design vehicle type, draw the turning radius R in road outside
0, the center of circle is O
0;
2), according to the design right-turn lane width w of design vehicle, be offset out the turning radius R of road inner side
i, the concyclic heart of turning radius in interior outside;
3) comprise the easement curve radius length R of entrance driveway curve, exit ramp curve
1, R
2, depend on the turning radius of road inner side, for the n of the turning radius of road inner side doubly, n value is 3-4;
4) respectively with O
0for the center of circle, R
1-R
i, R
2-R
idraw circular arc for radius, radius is R
1-R
ithe distance of circular arc and horizontal road inner side is R
1the intersection point O of parallel lines
1, be the center of circle of entrance driveway curve, radius is R
2-R
icircular arc is R with the distance of vertical road inner side
2the intersection point O of parallel lines
2, be the center of circle of exit ramp curve;
5) connect O
0o
1, O
0o
2and the intersection point of extension and road inside cord is respectively B
1, B
2;
6) respectively with O
1, O
2for the center of circle, R
1, R
2for radius is drawn circular arc, the arc A obtaining
1b
1, A
2b
2be entrance driveway curve and exit ramp curve, A
1, A
2be respectively arc A
1b
1, A
2b
2the contact of linking-up road inner side.
2. the method for claim 1, is characterized in that, described calculating traction towed vehicle, minibus wheel trace displacement are that, for traction towed vehicle, wheel trace displacement refers to the ultimate range of axis to rear axle; For minibus, it is taken turns trace displacement and calculates in order to lower Pythagorean theorem formula:
In formula: the distance between l=diaxon, the m of unit; R=sweep, the m of unit;
If calculating wheel trace displacement is negative value, illustrate that wheelmark is offset to center of curve; If l<<R, design formulas is reduced to-0.5 (l
2/ R).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4375107A1 (en) * | 2022-11-22 | 2024-05-29 | Volvo Truck Corporation | System and method for providing driver assistance |
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