witness mark n.— «There may be witness marks (scrapes and gouges) on the road surface that may suggest a post-impact movement of a vehicle.» —by George A. Peters, Barbara J. Peters Automotive Vehicle Safety Dec., 2002...
motor n.— «Officer Santos is one of 72 motorcycle officers assigned to traffic enforcement in the city. In part, because of that large number of motors, as they’re called, injury collisions involving Fresno drivers have dropped almost 30%...
strainer n.— «Sweepers—clumps of branches or roots that hang out over the water or jut up out of it—are to be avoided. They are dangerous. The current can pin a person against them. In a worst-case scenario, sweepers can push a person...
dead man’s switch n. especially in railroad usage, a safety device meant to stop or slow a vehicle or machine if its operator releases the controls. Also dead man’s handle, dead man’s brake, dead man’s lever, dead man’s pedal. (source: Double...
stoplog n.— «When the levee was completed 10 years ago the only gap was the one created for the railway tracks. The tracks made floodgates impossible, so the solution chosen is what is called a “stoplog” system. This system consists of...
sweeper n.— «Trees reaching out over the flow—”sweepers” in river parlance—are the dread of all whitewater paddlers, whether in a canoe, a kayak or a raft.» —“The river is wet and wild, yet safety is canoe club’s No. 1...