A methodology for non-motorized lane design considering heterogeneous traffic conflicts

doi:10.16265/j.cnki.issn1003-3033.2024.10.1652

Abstract

Abstract:

In order to reduce conflicts between heterogeneous traffic flows during overtaking, a non-motorized lane width design method that considers avoidance maneuver in heterogeneous traffic was proposed. This method represents an improvement over the traditional design approach. Firstly, the conflict levels of non-motorized vehicles were analyzed through the deceleration group proportions and pedaling cadence. Secondly, a vehicle-to-vehicle force model was established to calculate the forces between different types of vehicles. The additional safety gap was determined based on the relationship between these forces and lateral width. The recommended non-motorized lane width was the sum of the traditional lane width and the additional safety gap. Then, the rationality of the proposed design method was evaluated based on the safety levels of non-motorized lanes with different widths, which was obtained from the safety evaluation model developed in this research. Finally, data from four non-motorized lanes in Xi'an city were analyzed as case studies. The research results show that the deceleration group proportion is 0.93 times, pedaling cadence increases by 0.07 revolutions per second, and the road safety value is 1.07 times compared to traditional non-motorized lanes in non-motorized lanes accommodating heterogeneous traffic. These findings demonstrate that lanes meeting the design width have lower conflicts and greater safety.

Key words: heterogeneous traffic-flow, non-motorized lane, width design, vehicle-vehicle force, pedaling cadence, additional safety gap

CLC Number:

X951交通运输安全

LI Yan, SHAO Jin, LIU Linjian, LIANG Shujuan, WANG Fan. A methodology for non-motorized lane design considering heterogeneous traffic conflicts[J]. China Safety Science Journal, 2024, 34(10): 80-87.

Figures/Tables 12

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Fig.5

Table 2

Parameters and calibration results of the vehicle-vehicle force model

名称	值	描述
$m α$	75	常规自行车人车质量/kg
$m β$	115	电动自行车人车质量/kg
k_αα	0.019 8	常规-常规自行车作用力参数
k_αβ	0.021 2	常规-电动自行车作用力参数
k_ββ	0.023 6	电动-电动自行车作用力参数

Table 2

Fig.6

Table 3

Table 4

Fig.7

Table 5

Safety evaluation indicators of non-motorized lanes

路段名	路段宽度/m	$λ 1, λ 2, λ 3$	$P 1, P 2, P 3$	道路安全值M
长安路	3.2	0.429/0.452/0.119	0.108/0.178/0.012	7.80
二环南路	2.8	0.410/0.479/0.111	0.112/0.185/0.015	7.34
文艺南路	2.5	0.374/0.516/0.110	0.119/0.192/0.021	6.85
小寨路	2.0	0.290/0.601/0.109	0.125/0.218/0.037	5.84

Table 5

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路段名	宽度/m	机非隔离形式	流率/ (辆·h^-1)	类型	采集样本数/个	速度平均值/ (m·s^-1)	加速度绝对平均值/(m·s^-2)
长安路	3.2	绿化带隔离	982	自由骑行	120	3.26	0.375
长安路	3.2	绿化带隔离	982	超车干扰	582	2.42	0.329
二环南路	2.8	划线隔离	942	自由骑行	120	3.23	0.371
二环南路	2.8	划线隔离	942	超车干扰	512	2.35	0.325
文艺南路	2.5	绿化带隔离	771	自由骑行	120	3.22	0.368
文艺南路	2.5	绿化带隔离	771	超车干扰	455	2.31	0.322
小寨路	2.0	绿化带隔离与护栏隔离	725	自由骑行	120	3.16	0.360
小寨路	2.0	绿化带隔离与护栏隔离	725	超车干扰	386	2.26	0.318

机非隔离类型	均值	最小值	15%位分位数	85%位分位数
划线隔离	0.13	0.05	0.11	0.15
护栏隔离	0.28	0.12	0.21	0.30
绿化隔离	0.32	0.14	0.23	0.38

满足条件	常规自行车虚拟车道宽度	电动自行车虚拟车道宽度	划线/护栏/绿化带隔离边缘宽度值	路缘石边缘宽度值	安全避让距离	总宽度
常规-常规自行车避让	1.0×2	—	0.15	0.25	0.31	2.71
			0.30			2.86
			0.38			2.94
常规-电动自行车避让	1.0	0.98	0.15	0.25	0.38	2.76
			0.30			2.91
			0.38			3.00
电动-电动自行车避让	—	0.98×2	0.15	0.25	0.47	2.83
			0.30			2.98
			0.38			3.06