Iowa CAR DMV Practice Test 21

This type of triangular sign means drivers must yield. You must slow down as you come to an intersection marked with this sign and be prepared to stop. Let any other vehicles, bicyclists, or pedestrians pass safely before you proceed.

Warning signs are usually yellow with black markings. This sign indicates the presence of a crosswalk, regardless of if it is marked on the pavement or not. Upon seeing this sign, you should be alert and allow any pedestrians to cross the road safely.

A reflective orange triangle on the rear of a vehicle means it travels only at slow speeds. You may see this sign on roadwork equipment, farm vehicles, or horse-drawn wagons and carriages. It appears as a solid orange triangle during the day and a hollow red triangle at night.

If a green arrow turns into a solid green light, you may still turn in the direction that the arrow was pointing but you must first yield to pedestrians and oncoming traffic.

Regulatory signs require drivers to obey an indicated instruction. Failure to comply is subject to penalty.

Before passing, you should signal early enough for other drivers to know your plans in advance.

Iowa law requires drivers to use their headlights from sunset to sunrise. Headlights must also be used at any other time when visibility is limited to 500 feet or less.

A driver’s ability to safely operate a vehicle may be impaired at any BAC level, even a level lower than the legal limit. Any amount of alcohol can affect one’s judgment and physical coordination. Driving under the influence of even a small amount of alcohol can lead to criminal charges.

When a steady yellow light appears on a traffic signal, you should prepare to stop. If you are already within the intersection, you should clear the intersection as quickly as possible.

Diamond-shaped signs are used to warn of actual or possible hazards. The color orange is used for warning signs usually found in construction or maintenance areas.

You should always use your low beam headlights when driving in fog. High beam headlights may cause the light to reflect off of the fog and into your eyes.

When passing another vehicle on a two-lane roadway, you must return to the right side of the roadway when there is enough room between you and the vehicle you have passed.

Drivers are always required to stop for a stopped school bus when driving on a two-lane road, regardless of their direction of travel. You should exercise caution when driving near children.

Your blood alcohol content (BAC) depends on how much alcohol you drink, how much time passes between drinks, and your weight. It is not affected by the type of alcoholic beverages you drink, your level of physical fitness, or how well you can "hold your liquor."

Drivers must be especially careful when driving near a cyclist and should maintain a safe operating distance between their vehicle and the cyclist.

Before changing lanes, you should check your side mirrors and look over your shoulder to make sure it is safe to proceed.

After coming to a complete stop, you may turn left at a red light only if you are traveling on a one-way street and turning onto another one-way street. Only make the turn if there are no posted signs prohibiting such a turn.

Before you return to the driving lane when completing a pass, be sure there is a safe gap between your vehicle and the passed vehicle. When you can see both headlights of the vehicle in your rearview mirror, it is safe to return to the driving lane.

When you meet an oncoming school bus displaying flashing amber lights, you must slow to a speed no faster than 20 mph and be prepared to stop. If its red lights are flashing or if its stop arm is out, you must come to a complete stop at least 15 feet from the bus. Remain stopped as long as the red lights flash or the stop arm is out.

Alcohol is a depressant that dulls your judgment and makes your reflexes unreliable.

The speed at which you should drive your vehicle depends on road conditions, the weather, and the legal speed limit. You may never drive above the legal speed limit. Decrease your speed when anything makes conditions less than ideal.

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

Do not go around or under any lowered gate at a railroad crossing. Once the gate is raised, do not proceed across the tracks until you can see clearly in both directions and are sure there are no trains coming.

Warning signs are usually yellow with black markings. They alert you to conditions that are immediately ahead. There may be an upcoming change in traffic direction, a steep downgrade, or another potentially hazardous situation that requires action on the part of the driver.

Legal medications, both prescription and over-the-counter, can impair your ability to drive. They can be particularly dangerous when used in combination with alcohol.

The combination of alcohol and drugs, in some cases, can increase the effects of both the drugs and alcohol. It can be unsafe to drive after consuming either alcohol or drugs and is even more dangerous after combining them.

When entering a roadway from a driveway or private road, you must yield the right-of-way to pedestrians and traffic on the roadway.

Reducing your speed should be your first response to decreased visibility and dangerous road conditions.

A steady green traffic light indicates that the driver may continue through the intersection. The driver should yield to traffic or pedestrians already in the intersection and proceed when the intersection is clear.

If a steady yellow light appears when you are already within an intersection, you should continue through the intersection carefully.

A steady yellow arrow indicates that a red arrow is about to appear. Stop unless you are already within the intersection.

Your vehicle's stopping distance increases as your speed increases. When driving at high speeds, it is important to look well ahead of your vehicle to allow yourself space to safely react to hazardous situations.

Keep right when another driver begins to pass you on the left. Check for oncoming traffic and adjust your speed to let the passing vehicle move back into the right lane as easily as possible.

If your accelerator sticks while you are driving, keep your eyes on the road. Quickly shift the vehicle into neutral and apply steady pressure on the brake pedal. Pull off the road when it is safe to do so and turn off the engine.

When facing a green light, you must yield to pedestrians and vehicles already in the intersection. Drivers must yield to pedestrians when turning on a steady green signal.