CN102587237A - 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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- CN102587237A CN102587237A CN2012100943247A CN201210094324A CN102587237A CN 102587237 A CN102587237 A CN 102587237A CN 2012100943247 A CN2012100943247 A CN 2012100943247A CN 201210094324 A CN201210094324 A CN 201210094324A CN 102587237 A CN102587237 A CN 102587237A
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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 traffic safety design, road design field, be specifically related to consider the right-turn lane method for designing of large car turning performance.
Background technology
In intersection planning and design process, the laying of right-turn lane is directly connected to the efficient and the safety of the land scale and the traffic circulation of intersection.Considering on the basis that traffic is formed; For urban road intersection; Selecting length to be 5 meters wide in existing " planning of urban road level-crossing and design discipline " is that to be 12 meters wide be that two types of vehicles of large car of 2.5 meters are Design vehicle for 1.8 meters compact car and length; And for highway crossing; Select in existing " specification of the highway route design " length overall be 6 meters, wide be 1.8 meters minibus, it is that to be 16 meters wide be that 3 types of vehicles of saddle train of 2.5 meters are design vehicle for 2.5 meters truck and length overall that length overall is 12 meters wide.On port road; Be main vehicle with the oversize vehicle that has two TEU (Twenty-foot Equivalent Unit)s or a big container during traffic is formed; The length of wagon of this vehicle is about 16 meters, and three, four and five several types are arranged, and wherein five elongate containers vehicle proportions are bigger.Therefore, in harbour road and intersection design, as design vehicle, its common gabarite is shown in accompanying drawing 1 with this class standard truck of five elongate containers vehicles for considered.
Oversize vehicle is easy to generate off tracking in the turning process, shown in accompanying drawing 2.The description of off tracking has two modes: a kind of 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 the back axis of spindle; Another kind is to scan path width, the path difference between the trailer tire in outer traction tire and the back before it is defined as.The significant variable that another one is described the large car turning performance is exactly that interior wheel is poor; It is meant the poor of interior nose-wheel turn radius of Ackermann steer angle and inner rear wheel turning radius; For five elongate containers vehicles, then be inner rear wheel turning radius poor of interior front-wheel and the trailer of tractor.Generally speaking, vehicle body is long more, and the interior wheel difference of formation is just big more, scans path width and also can enlarge thereupon.
Because the existence of interior wheel difference, oversize vehicle is when turning, and the driving trace of forward and backward wheel does not overlap, and forms bigger corner between front of the car and the back vehicle body, very easily forms driver's " vision blind area ".For example,, just possibly cause to take turns in the back and roll the road surface away from or bump, cause traffic accident with bicycle and pedestrian that wait is walked if the large car driver only notices that in the right-hand bend process front-wheel can be through the existence of wheel difference in forgetting.
In the design of road horizontal curve, need to consider stable state off tracking and interior foreign steamer extent.Yet; In the practical application in China's road and traffic design field; Design for the right-turn lane; Adopt simple holocentric circle compound curve (accompanying drawing 3-A) in most cases, can adopt three-core circle compound curve (accompanying drawing 3-B) to simulate the driving trace of right-hand bend vehicle under the rare occasion, the curve design of the road kerb of turning right.The method of holocentric circle compound curve has length of tangent line, is prone to grasp and practical characteristics, can satisfy the designing requirement of urban road minibus, but but is difficult to adapt to for harbour road multiaxis large car.The right-turn lane design of adopting this method for designing to carry out large car often causes the not enough or excessive two kinds of adverse consequences of turning radius of turning radius (holocentric radius of circle) easily: the excessive intersection land used that causes of turning radius is wasted, and brings out the phenomenon of arbitrarily stopping in the corner, intersection easily; The turning radius deficiency then can reduce the ride comfort that cart goes, and increases traffic delay, even the situation of turnover stomatodeum adjacent lane wagon flow occurs disturbing.Equally, also there is similar problem in three-core circle compound curve method for designing.
Therefore, in harbour intersection traffic safety design, be necessary to consider that the turning performance of oversize vehicle carries out the design of right-turn lane, can ensure the ride comfort that large car is turned on the one hand, reduce interference, improve traffic efficiency the adjacent lane wagon flow; Can avoid large car to press the road kerb phenomenon on the other hand, reduce traffic accident, improve traffic safety.
Summary of the invention
The present invention is intended to solve the deficiency that overcomes prior art; Scan path width and interior wheel is poor to the maximum that occurs in the oversize vehicle right-hand bend process; A kind of right-turn lane method for designing of considering the large car turning performance is provided, safety, efficient and soil utilize three aspect with traditional design method bigger improvement is arranged.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 the multiaxis large car; The method that adopts measured data and trace simulation to combine estimates to comprise that maximum scans the turning parameter of path width, maximum wheel trace displacement and interior foreign steamer difference: at first utilize based on the track extraction software of video and retouch out front axle center and rear shaft center's trajectory; Make the RADIAL of two geometric locuses along the whole length of geometric locus; In these RADIALs, find out maximum radial distance, the maximum radial distance that maximum course deviation equals to survey deducts wide half the of trailer rear axle; Then, utilize track of vehicle simulation softward Autoturn that the standard truck is carried out the turning modeling experiment of 90 degree under different turning radius, the maximum that draws under the various conditions is scanned path width, maximum wheel trace displacement and interior foreign steamer difference design parameters; At last, utilize the measured data that obtains based on video, confirm last turning parameter checking based on turning modeling Experimental design supplemental characteristic;
Based on above turning parameter, design turning roadway through 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 match through an asymmetrical three-core circle compound curve that the entrance driveway sweep is less, the exit ramp sweep is bigger;
(3) under given water conservancy diversion degree of having a lot of social connections and interior radius of curvature condition, the three-core of the right-turn lane circle compound curve step of drawing:
1), draws the turning radius R in the road outside according to the design vehicle type
0, the center of circle is O
0
3) according to the design right-turn lane width w of design vehicle, the inboard turning radius R of road squints out
i, the concyclic heart of the turning radius in the interior outside;
4) the radius length R of easement curve
1, R
2, depend on the turning radius that road is inboard, be n times of the inboard turning radius of road, the n value is 3-4;
5) respectively with O
0Be the center of circle, R
1-R
1, R
2-R
iFor radius is drawn circular arc, the inboard distance of circular arc and road is R
1The intersection point O of parallel lines
1, promptly be the center of circle of easement curve 1, the inboard distance of circular arc and another road is R
2The intersection point O of parallel lines
2, promptly 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
2Be the center of circle, R
1, R
2For radius is drawn circular arc, the arc A that obtains
1B
1, A
2B
2Promptly be easement curve 1 and mitigation curve 2, A
1, A
2Be respectively arc A
1B
1, A
2B
2The contact that linking-up road is inboard.
Said calculating traction towed vehicle, minibus wheel trace displacement are that for the traction towed vehicle, the wheel trace displacement is meant the ultimate range of axis to rear axle; For minibus, it is taken turns trace displacement and calculates in order to following Pythagorean theorem formula:
In the formula: the distance between the l=diaxon, the m of unit; The R=sweep, the m of unit;
If calculating the wheel trace displacement is negative value, explain that then wheelmark squints to center of curve; If l＜＜R, then design formulas is reduced to-0.5 (l
2/ R)
Technical characterstic of the present invention and effect:
(1) with the measured data is the basis; Obtain the maximum wheelmark deviant of oversize vehicle earlier; Maximum is scanned the same position that path and maximum wheel trace displacement occur in turn inside diameter, the maximum that adopts estimation approach to obtain the actual travel of oversize vehicle scan path width and in wheel poor;
(2) take the method simulated, utilize Autoturn software that oversize vehicle is carried out the right-hand bend modeling experiment of 90 degree under different turning radius, the maximum that obtains large car under the different turning radius scan path width and in wheel poor;
(3) measured data combines with the experimental simulation data, confirms under the different turning radius conditions design parameters of camber line in large car right-hand bend water conservancy diversion degree of having a lot of social connections and the asymmetric three-core circle, instructs the design of right-turn lane on this basis;
(4) adopt the method for simulation modeling to estimate novel design method; Can verify right-turn lane method for designing and the compared with traditional design methods that the present invention proposes from simulation result; Intersection delay is suitable aspect efficient; And increase the ride performance of large car at traffic safety, reduce the traffic conflict with other lane flows, and can save occupation of land.
Description of drawings
Fig. 1 is harbor district of the present invention and Logistics Park standard truck size sketch map.
Fig. 2 scans path width and interior wheel differential intention for large car wheel trace displacement of the present invention, maximum.
Fig. 3 is a method for designing traditional and right-turn lane the present invention's proposition.Among the figure, A. holocentric circle compound curve, B. three-core circle compound curve, asymmetric three center of circle compound curves of C..
Large car based on the video analysis software actual wheelpath method for distilling of Fig. 4 for proposing among the present invention.
Fig. 5 is right-hand rotation water conservancy diversion degree of having a lot of social connections and the maximum sketch map that concerns of path width and lateral clearance that scans.
Fig. 6 makes workflow graph for water conservancy diversion degree of having a lot of social connections and interior radius of curvature known conditions infradextroversion sweep that the present invention proposes.Among the figure,
1) direction of track inflow is along X ' YX, and D ' CD is right side, a track road kerb;
2), draw the turning radius in the road outside according to the design vehicle type;
3) according to the design right-turn lane width w of design vehicle, the inboard turning radius of road that squints out, the concyclic heart of the turning radius in the interior outside;
4) the radius length R of easement curve
1, R
2, depend on the turning radius R that road is inboard
i, general value is R
i3-4 doubly.
It is continuous that water conservancy diversion degree of having a lot of social connections that Fig. 7 proposes for the present invention and interior radius of curvature known conditions infradextroversion sweep are made workflow graph.Among the figure,
5) respectively with O
0Be 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, promptly 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, promptly 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
2Be the center of circle, R
1, R
2For radius is drawn circular arc, the arc A that obtains
1B
1, A
2B
2Promptly be easement curve 1 and mitigation curve 2.
Fig. 8 is the practical implementation technology path that the present invention adopted.
Fig. 9 scans path width among the embodiment 1 based on the maximum course deviation and the maximum of measured data.
Figure 10 is the simulation evaluation modeling design sketch among the embodiment 1.
Figure 11 is that novel design method and traditional design method are being used comparison (instance 1) on the ground.
The specific embodiment
The present invention is directed to that the maximum that occurs in the oversize vehicle right-hand bend process is scanned path width and interior wheel is poor; Propose a kind of right-turn lane method for designing of considering the large car turning performance, and utilize three aspects to compare the difference of novel design method and traditional design method from safety, efficient and soil.This new method for designing mainly comprises the content of three aspects: scan the integrated geometric construction flow process in right-turn lane under the interior camber line design of the round right-hand bend of right-hand rotation water conservancy diversion degree of having a lot of social connections asymmetric three-core definite, that the interior wheel of consideration is poor of path width, given water conservancy diversion degree of having a lot of social connections and the interior radius of curvature condition 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 the relatively right-hand bend process; (2), utilize traffic safety analysis software SSAM to compare the traffic conflict in the large car right-hand bend process based on the VISSIM model; (3) utilize the track difference of AutoTurn software simulation standard truck under the different designs method, relatively the land utilization efficiency of different designs method.
When calculating 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, the wheel trace displacement is meant the ultimate range of axis to rear axle.For minibus, it is taken turns trace displacement and calculates in order to following Pythagorean theorem formula:
In the formula: the distance between the l=diaxon, m; The R=sweep, m;
If calculating the wheel trace displacement is negative value, explain that then wheelmark squints to center of curve; If l＜＜R, then design formulas can be reduced to-0.5 (l
2/ R).
For the multiaxis large car; The method that the present invention adopts measured data and trace simulation to combine estimates respectively to turn parameter: at first utilize based on the track extraction software of video and retouch out front axle center and rear shaft center's trajectory; Make the RADIAL (shown in accompanying drawing 4) of two geometric locuses along the whole length of geometric locus; In these RADIALs, find out maximum radial distance, the maximum radial distance that maximum course deviation equals to survey deducts wide half the of trailer rear axle; Then, utilize track of vehicle simulation softward Autoturn that the standard truck is carried out the turning modeling experiment of 90 degree under different turning radius, the maximum that draws under the various conditions is scanned design parameterss such as path width, maximum wheel trace displacement and interior foreign steamer difference; At last, utilize measured data that the trace simulation data are checked, confirm last design parameters.Based on above design parameters, design turning roadway through following method:
(1) width on water conservancy diversion road should equal off tracking (maximum is scanned path width) and lateral clearance sum, shown in accompanying drawing 5.
(2) large car right-hand bend track can carry out match through an asymmetrical three-core circle compound curve that the entrance driveway sweep is less, the exit ramp sweep is bigger.
(3) under given water conservancy diversion degree of having a lot of social connections and interior radius of curvature condition, the three-core of right-turn lane circle compound curve can draw according to the illustrated step of Fig. 6-7.
Elaborate below in conjunction with 8 pairs of embodiments of the invention of accompanying drawing: at first carry out the collection of video data to the more intersection of harbour large car; Secondly confirm the highest large car type of ratio; As the type design vehicle; Through video analysis software the wheelpath of type design vehicle is extracted (time precision 0.1 second, 0.5 meter of spatial accuracy) respectively then and through turn right modeling experiment of Autoturn; The maximum that obtains under the different condition is scanned design parameterss such as path width and interior wheel difference, carries out the match of asymmetric three-core circle compound curve at last based on these parameters.
Present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment 1: right-turn lane of the present invention method for designing is used for the traffic safety design of certain harbor district one typical intersection right-turn lane.Form through analyzing this harbor district oversize vehicle vehicle; Elongate containers vehicle shared ratio in this intersection traffic constitutes all reaches more than 60%; The overwhelming majority all is the elongate containers vehicle, and therefore in the traffic safety design of harbor district right-turn lane, adopting the elongate containers vehicle is the type design vehicle.
In the track leaching process, choose 15 satisfactory samples, obtain maximum course deviation and the maximum distribution map that scan path width of type design vehicle under same link condition, identical turning radius at last, see accompanying drawing 9.Utilize Autoturn software that the type design vehicle is carried out the turning modeling experiment of 90 degree under different turning radius, choose 15 meters, 20 meters, 25 meters and 30 meters turning radius respectively and carry out simulated experiment, obtain the experimental result in the table 1.
It is poor that maximum is scanned the wide and interior wheel in path under the different turning radius of table 1 type design vehicle (R)
| Maximum is scanned path width/m | Poor/the m of interior wheel | |
| R＝15 | 4.48 | 1.98 |
| R＝20 | 3.95 | 1.45 |
| R＝25 | 3.62 | 1.12 |
| R＝30 | 3.42 | 0.92 |
In conjunction with the accompanying drawings 9 with table 1 in the result confirm the design parameter under water conservancy diversion degree of having a lot of social connections and the two kinds of methods for designing (the round composite curve of asymmetric three-core that traditional symmetrical three-core circle composite curve and the present invention propose) of different radiuss of turn in this harbor district right-turn lane design respectively, 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 water conservancy diversion degree of having a lot of social connections
Choosing turning radius is that simulation modeling is carried out in 25 meters right-hand rotations under the condition, and this moment, corresponding right-turn lane width was 5.0 meters, utilized microscopic simulation software VISSIM to carry out simulation modeling.Entrance driveway in the simulation modeling is three tracks (1 left turn lanes+1 direct lane+1 right-turn lane), and with the input parameter of the data in the table 4 as simulation modeling, simulated effect is seen shown in the accompanying drawing 10.Utilize the information such as car speed, track of VISSIM emulation output, by the turn right traffic conflict analysis of car of traffic safety analysis software SSAM.
Table 4VISSIM simulation modeling input parameter
| Flow | The left-hand rotation ratio | The craspedodrome ratio | The right-hand rotation ratio | The cart ratio |
| 1973veh/h | 0.06 | 0.46 | 0.48 | 98％ |
The simulation result that obtains at last 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; Compare with conventional method, the right-hand rotation cart in the novel design method with significantly reduce serious conflict of straight line vehicle, improve traffic safety, and show the probability (reducing 61.43%) that takies when having reduced the right-hand rotation cart turns with entrance driveway straight line track indirectly.
Table 5 is incured loss through delay and the traffic conflict evaluation result
(annotate: in SSAM analyzed, TTC (Time To Colision) value thought that less than 1.5 seconds traffic conflict takes place)
Design parameters when Figure 11 is 15 meters with turning radius is reference; Holocentric circle compound curve, symmetrical three-core circle compound curve and three kinds of method for designing comparisons on floor space of asymmetric three-core circle compound curve have been 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 to oversize vehicle is confirmed the width on right-hand bend water conservancy diversion road; And adopt in the asymmetric three-core circle 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 the large car turning performance is characterized in that, comprises the following steps:
Calculate traction towed vehicle, minibus wheel trace displacement;
For the multiaxis large car; The method that adopts measured data and trace simulation to combine estimates to comprise that maximum scans the turning parameter of path width, maximum wheel trace displacement and interior foreign steamer difference: at first utilize based on the track extraction software of video and retouch out front axle center and rear shaft center's trajectory; Make the RADIAL of two geometric locuses along the whole length of geometric locus; In these RADIALs, find out maximum radial distance, the maximum radial distance that maximum course deviation equals to survey deducts wide half the of trailer rear axle; Then, utilize track of vehicle simulation softward Autoturn that the standard truck is carried out the turning modeling experiment of 90 degree under different turning radius, the maximum that draws under the various conditions is scanned path width, maximum wheel trace displacement and interior foreign steamer difference design parameters; At last, utilize the measured data that obtains based on video, confirm last turning parameter checking based on turning modeling Experimental design supplemental characteristic;
Based on above turning parameter, design turning roadway through 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 match through an asymmetrical three-core circle compound curve that the entrance driveway sweep is less, the exit ramp sweep is bigger;
(3) under given water conservancy diversion degree of having a lot of social connections and interior radius of curvature condition, the three-core of the right-turn lane circle compound curve step of drawing:
1), draws the turning radius R in the road outside according to the design vehicle type
0, the center of circle is O
0
2) according to the design right-turn lane width w of design vehicle, the inboard turning radius R of road squints out
i, the concyclic heart of the turning radius in the interior outside;
3) the radius length R of easement curve
1, R
2, depend on the turning radius that road is inboard, be n times of the inboard turning radius of road, the n value is 3-4;
4) respectively with O
0Be the center of circle, R
1-R
i, R
2-R
iFor radius is drawn circular arc, the inboard distance of circular arc and road is R
1The intersection point O of parallel lines
1, promptly be the center of circle of easement curve 1, the inboard distance of circular arc and another road is R
2The intersection point O of parallel lines
2, promptly be the center of circle of easement curve 2;
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
2Be the center of circle, R
1, R
2For radius is drawn circular arc, the arc A that obtains
1B
1, A
2B
2Promptly be easement curve 1 and mitigation curve 2, A
1, A
2Be respectively arc A
1B
1, A
2B
2The contact that linking-up road is inboard.
2. the method for claim 1 is characterized in that, said calculating traction towed vehicle, minibus wheel trace displacement are that for the traction towed vehicle, the wheel trace displacement is meant the ultimate range of axis to rear axle; For minibus, it is taken turns trace displacement and calculates in order to following Pythagorean theorem formula:
In the formula: the distance between the l=diaxon, the m of unit; The R=sweep, the m of unit;
If calculating the wheel trace displacement is negative value, explain that then wheelmark squints to center of curve; If l＜＜R, then design formulas is reduced to-0.5 (l
2/ R).
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