System for maximising and controlling tidal flow of traffic in road tunnels and on freeways

摘要

A road freeway system for carrying vehicles is described which includes at leastthree carriageways, each carriageway including at least one lane for carryingvehicles thereon, wherein at least one carriageway is configured as a tidal flowcarriageway which is adapted to carry vehicles in one direction at selected timesand carry vehicles in an opposite direction at other selected times. In some preferredembodiments each carriageway is an underground tunnel. Vehicle control devicesfor diverting vehicles from one lane to another lane are also provided in preferredembodiments, in some arrangements being provided on exit and entry ramps. Methodsof use of the carriageways are also described.