(Olympia, WA)  --  Washington state troopers are monitoring the highways for left-lane "campers" through tomorrow.  The Washington State Patrol says the statewide-emphasis patrols are intended to make drivers aware that the left lane is used as a passing lane, and that driving for extended periods in the left lane is illegal.  Troopers are being assigned to locate and stop left-lane violators.  WSP says nearly 14-thousand left-lane campers were stopped throughout the state last year.