Modern roundabouts are designed to control traffic flow at intersections without the use of stop signs or traffic signals. U.S. experience with modern roundabouts is rather limited to date, but in recent years there has been growing interest in their potential benefits and a relatively large increase in roundabout construction. This interest has created a need for data regarding the safety effe...

1 This paper provides a comprehensive analysis of roundabout crash patterns. First, an improved 2 method was used to calculate crash type percentages for Wisconsin roundabouts. Second, the 3 crash type patterns were compared between roundabout types and between at-fault driver 4 residency types. It was found that the entering-circulating crash was the severest at single-lane 5 roundabouts while...

Mobility, safety, and environmental sustainability are priorities in the geometric design of roundabouts. This paper presents a multi-objective optimization model that determines elements single-lane roundabouts using all three objectives. The user can specify weights for objectives, or determine optimal weights. Mobility is defined terms roundabout delay modeled United Kingdom empirical model....

This paper proposes Multi-stream Minimum Acceptable Space (MMAS) Cellular Automata (CA) models to simulate driver behavior and its effects on traffic flow at three-lane roundabouts. Using cellular automata, the models are developed by modeling the detailed space considerations for drivers entering un-signalized threelane roundabouts. Heterogeneity and inconsistency of driver behavior and intera...

Although autonomous vehicle technology has evolved significantly in recent years, the navigation of self-driving vehicles complex scenarios is still an open issue. One major challenges these conditions safe on roads to public traffic. The main issue interaction with regular traffic, as behaviors and intentions human-driven are hard predict understand. In this paper we propose a strategy allow s...

Cycling for transportation is an important resource to reduce urban traffic congestion, enhance personal health, energy consumption, and improve air quality, the safety of cyclists in cities becoming a topic growing interest. As shown literature, number cyclist fatalities due road crashes occurring at intersections. This study combines probabilistic damage model perform risk analysis collisions...

The calculation and evaluation of traffic noise is an important task in urban road design. Roundabouts are a common form intersection. complexity operations makes the near roundabout challenging. To explore at roundabouts, cellular automaton flow model for two-lane established. Based on this model, dynamic simulation method roundabouts proposed. operation emissions simulated. vehicle speed dist...

Roundabouts are widely used in Gulf area for organizing traffic at road intersections. Big traffic jams, especially at the roundabout intersections, are happening at peak hours. Since there is no traffic signal to organize the traffic at these areas, a traffic policeman has to stand there for long hours in the very hot weather (in summer in Gulf area) to organize the traffic. Off-line traffic s...

The paper presents a microsimulation approach for assessing the safety performance of turbo-roundabouts where Cooperative Autonomous Vehicles “CAVs” have been introduced into traffic mix alongside conventional vehicles “CVs”. Based on analysis vehicle trajectories from VISSIM and subsequent conflicts through Surrogate Safety Assessment Model (SSAM), research aims to evaluate benefits lanes are ...