Abstract
The vehicle nonstrict priority give-way behavior (VNPGWB) is a common part of traffic interaction between motorized and nonmotorized vehicles in many countries. This study proposes a mixed-flow cellular automaton model to simulate the passing of vehicles in front of bicycles at crosswalks. The mixed-flow model combines a vehicle model with a bicycle model, using nonstrict priority give-way and strict give-way two driving behaviors defined as relating to the decision point rule and the launching rule, respectively. Simulation results showed that as the vehicle and bicycle inflow rates increased, a critical inflow rate divided vehicle and bicycle traffic flow into free flow and saturated flow conditions. The values of vehicle saturation flow decreased from 0.34 to 0.05, and the values of bicycle saturation flow decreased from 0.54 to 0.44, indicating that the mixed traffic flow has a negative effect on vehicle and bicycle saturated flow. Results also showed that VNPGWB effectively improves vehicle saturation flow over that of the strict give way. The advantage of VNPGWB is more significant when vehicles and bicycles are in saturation traffic flow.
Highlights
In many countries in Europe and Asia, the bicycle is still an important mode of transportation
The decision a driver makes to pass through the crosswalk or not depends on the bicycle’s position and speed. Since it is based on the driver’s subject assessment, the behavior is defined as vehicle nonstrict priority give-way behavior (VNPGWB)
In order to simulate the mixed-flow cellular automaton (CA) model, the abovementioned methods are integrated into one executable algorithm, which is processed in a parallel computing setting using the Python programming environment. e algorithm (Algorithm 1) calculates the process of t ⟶ t + 1
Summary
In many countries in Europe and Asia, the bicycle is still an important mode of transportation. Shared bicycles have gained tremendous popularity as a result of their convenience [5, 6] Due to their vulnerability in a collision, cyclists are subject to higher safety risks than drivers of vehicles [7, 8]. The decision a driver makes to pass through the crosswalk or not depends on the bicycle’s position and speed Since it is based on the driver’s subject assessment, the behavior is defined as vehicle nonstrict priority give-way behavior (VNPGWB). There is a great impact on traffic flow when vehicles are waiting for bicycles at crosswalks In this case, nonstrict priority allows vehicles to leave the conflict area earlier, mitigating their effects on subsequent vehicles and thereby improving the capacity of the road and intersection. E rest of this paper is organized as follows: Section 2 reviews the literature; Section 3 describes the proposed mixed method in detail; Section 4 measures numerical simulation; and Section 5 concludes the paper
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