Single, solid, yellow lines are used as left edge lines on divided highways. If you see the reverse, you are traveling in the wrong direction. On certain multi lane highways, a special center lane is reserved exclusively for two-way left turn movements in both directions. The two way left turn lane must not be used for passing or overtaking another vehicle. The marking for this type of lane is shown by the diagram below.
Red markers indicate wrong way movements for motorists.
Traffic Officers Under special circumstances, an officer may be directing the flow of traffic. If so, obey the officer s hand signals instead of the normal traffic signals or signs. Most traffic officers signal drivers to stop by holding up one hand with the palm facing the vehicle and giving a long blast on the whistle. The officer signals drivers to start or to keep moving by motioning with the hand and giving a series of short blasts on the whistle. At night, the traffic officer may signal by using a flashlight.