Capacity of Urban Freeway Work Zones

Simulation-Based Estimates of Delays at Freeway Work Zones

Work zone related traffic delay is an important cost component on freeways with maintenance activities. This study demonstrates that delays are always underestimated by using the deterministic queuing theory. Computer simulation is a valuable approach of estimating delay under variety of existing and future conditions. However, a single simulation run, which can be quiet costly in terms of both...

Clustering-Neural Network Models For Freeway Work Zone Capacity Estimation

Two neural network models, called clustering-RBFNN and clustering-BPNN models, are created for estimating the work zone capacity in a freeway work zone as a function of seventeen different factors through judicious integration of the subtractive clustering approach with the radial basis function (RBF) and the backpropagation (BP) neural network models. The clustering-RBFNN model has the attract...

Implementing Estimation of Capacity for Freeway Sections

Based on the stochastic concept for freeway capacity, the procedure of capacity estimation is developed. Due to the fact that it is impossible to observe the value of the capacity and to obtain the probability distribution of the capacity, the product-limit method is used in this paper to estimate the capacity. In order to implement estimation of capacity using this technology, the lifetime tab...

Impact of Weather on Urban Freeway Traffic Flow Characteristics and Facility Capacity

Impacts of Weather on Urban Freeway Traffic Flow Characteristics and Facility Capacity

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...