Ramping Up
The reconstruction of the Sprinfield interchange, also known as the Mixing Bowl�one of the largest, most complex highway projects in the nation�has reached the halfway point. But some...
A Microcomputer Program to Evaluate Low Cost Modifications on Urban Freeways
This paper presents a user-friendly, menu-driven microcomputer program, RAMP, for analysis and evaluation of freeway ramp junction level of service. RAMP automates the approximation procedure...
The Automation of Freeway Ramp Junctions Analysis
Congestion on urban freeways has been steadily increasing. In contrast, capacity expansion, by means of constructing new roadways, has not kept pace with the growth in demand. The primary...
Neural Networks in Freeway Control
Hierarchical control strategies have been proposed for freeway optimum control since the 1960's. Multi-layer hierarchical control optimizes system performance to determine a nominal metering...
Houston Moves Forward Again
The National Transportation Plan, as released by Transportation Secretary Samuel Skinner, advocates the construction of toll roads and calls on local governments to devise and finance...
Optimal Ramp-Metering Control for Freeway Corridors
The paper discusses an optimal ramp-metering control model wherein a corridor is discretized into small road sections, with density as the state variable and ramp metering rates, the control...
Application of Control Theory to Regulate Traffic Flow on Periurban Ringways
Two on-ramp metering strategies are compared by a simulation study for the Boulevard Peripherique in Paris. The first one is a local strategy, based on linear feedback control theory....
Runway Roughness Measurement, Quantification and Application: The Boeing Approach
The measurement of runway roughness and the determination of the severity of runway roughness have long been the subject of nebulous discussion and esoteric description. By considering...
Tiedback Walls Untie Intersection
The intersection of Gallows Rd. and Arlington Blvd. in Virginia's Fairfax County required separation. Tiedback retaining walls, which required only 18 in. instead of the 18-22...
Computerized Traffic Signals; Good for My City�
Good question. The answer is, It depends. On freeways, some computer-controlled on-ramp signals are dramatically speeding rush-hour traffic. The situation is more complicated when you...
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