• A solid white line with a bicycle insignia along the side of the road indicates an area designated for bicycle traffic only. Bicycles must travel in the same direction as adjacent traffic.

Seeing yellow spots on a white background may be due to the afterimage effect. The afterimage effect is when you see an image that’s no longer there.

Question: In my city, there is a double yellow line on the main roadway and yet some motorists cross both lines to park against oncoming traffic, many at dark with headlights on. Why is this allowe… ...

A white line with dashes indicates that drivers can change lanes in areas where this type of marking is present. A line of shorter and thicker white dashes indicates that the lane will end.

A: A crash can occur anytime a driver chooses to cross over a solid or double solid yellow or white line. Engineers and safety personnel place these lane markers in areas where it’s unsafe to pass.

Yellow Line to return May 7 after eight-month bridge, tunnel project. Crews reinforced a tunnel that juts into the Potomac from L’Enfant Plaza and re-anchored tracks on a nearby bridge.

A mysterious yellow line painted along Interstate 95 in Florida has puzzled motorists — and confused cars with driver-assistance technology as state officials rush to clean up the problem.