A moving bottleneck

Suppose that a vehicle or convoy enters a two-lane unidirectional roadway a nd travels at a velocity v* less than the prevailing traffic. This moving b ottleneck may cause a queue to form as vehicles try to pass the obstruction . It is shown that by going to a moving coordinate system traveling at velo city v* the analysis of this can be transformed into a corresponding analys is of flow past a stationary bottleneck. The theory is then extended to inv estigate possible consequences of trucks on grades. (C) 1998 Elsevier Scien ce Ltd. All rights reserved.