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Center for Transportation Studies

Programs & Labs

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Spring 2001

In this special issue: Ramp metering

Considering the alternatives
Although many cities have traffic signals on freeway entrance ramps, the algorithms that govern these signals' operation vary widely.

Fast and fair traffic control
Outside the laboratory, the debate over ramp metering in the Twin Cities has focused more on issues of equity and efficiency than on questions of absolute system-wide performance.

Under the virtual microscope
"microscopic" simulation is capable of achieving much greater accuracy than simulations that treat traffic as a continuous fluid flow—but the increased detail comes at the price of greater demand on the computer and its human users.