1993 Buick LeSabre Owner's Manual - Page 149

I A I u RAILROAD ADVANCE CROSSING LOW SHOULDER BRIDGE L FLAGGER AHEAD WORKERS AHEAD YELLOW indicates a general warning. Slow down and be careful when you see a yellow sign. It may signal a railroad crossing ahead, a no passing zone, or some other potentially dangerous situation. Likewise, a yellow solid line painted on the road means "Don't Cross." ORANGE indicates road construction or maintenance. You'll want to slow downwhen you see an orange sign, as part of the road may be closedoff or torn up. And there may be workers and maintenancevehicles around, too. 147