Except as otherwise directed by proper authority, no person shall operate, or cause to be moved, any vehicle on the Thruway system except in the direction of traffic. The driver of a vehicle entering a service area, interchange, shoulder, or deceleration lane shall enter such area, interchange, shoulder or lane from the adjacent traffic lane, exercising caution so as not to interfere with or endanger traffic. Similarly, the driver of a vehicle leaving a service area, interchange, shoulder, or acceleration lane shall enter the Thruway system using the adjacent traffic lane, exercising caution so as not to interfere with or endanger traffic.