<P> Since the driver of the truck has no visual on the end of the trailer or any possible vehicles in the next lane (because the load obstructs the mirrors), the general procedure is as follows: The truck driver sees an obstacle and signals with his left (or right, if in a left - side traffic country) turn signal (aka "blinker"). The driver of the trailing car waits until the adjacent lane is clear and moves so that the truck driver sees his or her car, thus preventing anyone from standing next to the truck . Then the trailing car moves a little back to stay clear of the truck's path . As soon as the trailer has cleared the obstacle, the trailing car again moves forward and flashes its headlights to inform the truck driver that it's safe to return in their lane . A pilot car driver may temporarily block traffic at intersections to ensure the safe passage of the truck . </P> <P> Oversize loads present a hazard to roadway structures as well as to road traffic . Because they exceed design clearances, there is a risk that such vehicles can hit bridges and other overhead structures . Over-height vehicle impacts are a frequent cause of damage to bridges, and truss bridges are particularly vulnerable, due to having critical support members over the roadway . An over-height load struck the overhead beams on the I - 5 Skagit River bridge in 2013, which caused the bridge to collapse . </P> <P> Different countries have different approaches to licensing oversize / overweight loads . Licenses may be issued for a specific load, for a period of time, or to a specific company . In most jurisdictions, the permit specifies the exact route a vehicle must take, and includes clearance warnings . However, in some places, such as Washington State, drivers are responsible for choosing their own route . The carrier can choose to obtain the required permits themselves or go through a permit service . </P>

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