Warning signs prepare drivers for upcoming road conditions and hazards and are usually yellow and black. This sign tells drivers that a lane is ending and that they should prepare to allow traffic to merge safely.

In Oklahoma, fines for all traffic violations occurring in a construction or maintenance zone are doubled if workers are present and warning signs are present in advance of the work zone.

You must obey speed limits at all times. You may not exceed the speed limit to pass another vehicle.

Being fatigued while driving is similar in danger to driving under the influence of alcohol. If you begin to feel tired while driving, the best thing to do is to stop driving.

When driving near heavy trucks, other drivers and highway users must make allowances for the increased stopping distance required by the large vehicles. Drivers of smaller vehicles should remain in locations where they can be seen by the driver of the large vehicle and where their view of traffic is not blocked by the vehicle.

You should always reduce your speed and use extra caution when children are in the vicinity. They may fail to understand the danger and may run out in front of you without looking.

When passing, you should not return to your original lane until the entire vehicle you've just passed is visible in your rearview mirror.

When turning left at a traffic signal, you must yield the right-of-way to pedestrians and oncoming traffic.

Even if your light is green, you must not enter an intersection unless you can get completely through the intersection before the light turns red. If you block the intersection, you can be cited.

A double yellow centerline means that it is prohibited for traffic from either direction to cross the centerline to pass.

Before merging into interstate traffic, you should identify a gap, accelerate to the speed of traffic, and signal. Merge into the gap when it is safe to do so. Be alert to other traffic and do not expect other drivers to clear the lane.

After yielding the right-of-way to traffic within an intersection or crosswalk, a driver may go in the direction a green arrow is pointing, regardless of other lights present.

It is dangerous to move injured persons. You should avoid moving the injured unless it is absolutely necessary to remove them from areas threatened by fire or other dangers common to a crash scene. Keep the injured lying or sitting down until competent medical aid arrives.

Every time you want to change lanes or otherwise move your vehicle to the right or left, signal to alert other drivers to your intentions. Always check your mirrors and turn your head to check your blind spot before attempting any lateral move.

Warning signs provide notice to road users of a situation that might not be readily apparent and are usually yellow with black markings. This sign warns drivers of an upcoming steep hill. Drivers should adjust their speed accordingly to avoid collisions and brake damage.

For drivers age 21 or older, it is illegal to operate a motor vehicle with a blood alcohol concentration (BAC) of 0.08 percent or higher. Driving while under the influence of alcohol is not only illegal, but dangerous.

When turning, you should look to the rear and both sides of your vehicle to ensure it is safe to proceed before making the turn. Adjust your speed to safely complete the turn.

Highway work zones are established according to the type of work underway along the roadway. Signs in work areas are typically diamond-shaped, orange, have black letters or symbols, and serve as a warning that people are working on or near the highway.

When approaching railroad tracks, you should look, listen, slow down, and be prepared to stop for trains or other vehicles that may be using the rails.

Driving defensively means anticipating potential errors made by others and preparing to compensate for their mistakes.