View-Dependent Streaming of Progressive Meshes (Figure 9)

A motorized traffic-way controller wherein a retractile tire barrier and opening gate barrier are coordinated to operate in unison by a motor drive that is recycled by closing a mode switch through cam controlled "stop" and "go" switches responsive to the position of the motor drive, the installation being above grade with low profile modules having retractile tooth configurations that projects for tire damage, and with a signal barrier supported by a drive unit at the side of the traffic-way and in the form of an arm that is lifted when the tooth configuration is retracted, the modules and drive unit being adapted to coupled engagement one with the other when assembled.