This study aimed to investigate the relative performance of two models (negative binomial (NB) model and two-component finite mixture of negative binomial models (FMNB-2)) in terms of developing crash modification factors (CMFs). Crash data on rural multilane divided highways in California and Texas were modeled with the two models, and crash modification functions (CMFunctions) were derived. T...

This paper considers a lane routing problem in an Automated Highway System (AHS). Lane routing is important because the problem of managing the traac ow on a multilane AHS plays a major role in an urban environment. On the other hand, because analytical approaches are impossible for various, almost unpredictable traac situations, traac simulations are indispensible for the design and the evalua...

IN T R O D U C T IO N Today the demands placed on any state transportation or highway agency to provide technical assistance to local communities require very flexible approaches to problem solving. The Ohio Department of Transportation is no exception and as a result we find a much greater need to assure that technical proficiency is maintained within our techni­ cal staff, particularly in the...

The effect of trucks on the level of service is determined by considering passenger car equivalents (PCE) of trucks. The current version of Highway Capacity Manual (HCM) uses a single PCE value for all tucks combined. However, the composition of truck traffic varies from location to location; therefore, a single PCE value for all trucks may not correctly represent the impact of truck traffic at...

Adverse weather degrades the capacities and operating speeds on roadways, resulting in congestion and productivity loss. Without a solid understanding of the mobility impacts of weather on traffic patterns, freeway operators do not have the estimates of speed and capacity reductions to predict and simulate the impacts of traffic management strategies. Nearly all traffic engineering guidance and...

This paper implements and analyzes a highway traffic-flow simulation based on continuum modeling of traffic dynamics. A traffic-flow simulation was developed and mapped onto a parallel computer architecture. Two algorithms (the one-step and two-step algorithms) to solve the simulation equations were developed and implemented. Tests with real traffic data collected from the freeway network in th...

This work implements and analyses a highway traffic flow simulation based on continuum modeling of traffic dynamics. A traffic-flow simulation was developed and mapped onto a parallel computer architecture. Two algorithms (the 1-step and 2-step algorithms) to solve the simulation equations were developed and implemented. They were then tested on an nCUBE2, a 1024 node hypercube with very slow i...

Work-zone safety continues to be a priority and a concern for the Federal Highway Association as well as most state departments of transportation. The main objective of this study is to uncover work-zone freeway crash characteristics to help develop countermeasures that limit work-zones’ hazards. The Florida Crash Records Database for years 2002, 2003, and 2004 was utilized for this study. Cond...

The merging area of the freeway is an with a high incidence traffic accidents. With development connected and automated vehicles (CAVs) V2X technology, efficiency ramp areas has been significantly improved. However, current research mostly focuses on single mainline lane ramp, there are few cases multiple lanes. In this paper, we present collaborative model rule-based lane-changing strategy in ...