Solid yellow lines on a roadway are designed to separate traffic that is moving in different directions. Double yellow lines are only seen on roadways where there is two-way traffic and indicate whether passing from eith... More »

A yellow line divides traffic flow in opposite directions, and motors are not allowed to cross the line, according to New York Safety Council. The same rule applies to double yellow lines, but motorists can cross under c... More »

According to the California Department of Motor Vehicles, solid, parallel yellow lines indicate that vehicles are not allowed to pass. Vehicles are prohibited from driving on the left side of these double solid lines. More »

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According to the U.S. Department of Transportation, dotted yellow lines indicate areas on a road where drivers may pass other vehicles. The less-common broken yellow line along the side may indicate the edge of the drivi... More »

There are many different traffic violations. Violations are typically categorized as major or minor. Serious infractions include speeding, drunk or distracted driving, running a red light or stop sign, and leaving the sc... More »

Improper lane usage is defined by the state of Illinois as driving a vehicle in any way other than what is practically possible within a single lane of traffic and not moving out of that lane until the driver has determi... More »

Traffic problems result from either traffic overload or traffic disturbances, according to HowStuffWorks. Some of these problems are planned and thus predictable, while others occur without prior notice and can cause sud... More »

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