1993 Chevrolet Camaro Owner's Manual - Page 139

REVERSIBLE LANE ON MULTI-LANE ROADWAY NO PASSING ZONE Many city roads and expressways, and 2ven bridges, use reversible-lane traffic control during rush hours. A red X light above a lane means no driving in that lane at that time. A green arrow means you may drive in that lane. Look for the signs posted to warn drivers what hours and days these systems are in effect. Pavement Markings Pavement markings add to traffic signs and signals. They give information to drivers without taking attention from the roadway. A solid yellow line on your side of the road or lane means "don't cross." Your Own Signals Drivers signal to others, too. It's not only more polite, it's safer to let other drivers know what you are doing. And in some places the law requires driver signals. Turn and lane change signals: Always signal when you plan to turn or change lanes. If necessary, you can use hand signals out the window: Left arm straight out for a left turn, down for slow or about-to-stop, and up for a right turn.