Iowa CAR DMV Practice Test 18

Every 0.02 percent increase in blood alcohol concentration nearly doubles a driver's risk of being in a fatal crash.

White lines between lanes indicate that the lanes are traveling in the same direction. Broken white line markings indicate that it is legal to pass another vehicle when safe.

When leaving an interstate, you should maintain your speed until you enter the deceleration lane, at which point you should reduce your speed to the exit ramp's posted advisory speed.

This sign directs traffic to the right of an island or barrier. The road ahead is divided.

You must yield to pedestrians at all times. If the pedestrians are jaywalking or crossing the street where they should not be, you must still stop for them.

As daylight begins to fade, turn on your low beams to help others see you. Only use your high beam headlights in an open area where no other drivers are present.

When being approached by an emergency vehicle that is using its lights and/or sirens, you must immediately pull to the right side of the road and allow it to pass.

Blind spots are areas that a driver cannot see if they look in their mirrors. Large trucks have large blind spots that drivers of other vehicles should avoid.

Yellow lines tell you that the traffic on the other side of the lines is moving in the opposite direction. You should never cross two solid yellow lines to pass from either direction.

Yellow lines separate traffic moving in opposite directions. Dashed lines on the pavement indicate that passing is permitted when safe.

Collisions are more likely to happen when one driver moves faster or slower than the other vehicles on the road. Driving faster than other traffic increases your chance of being involved in a collision. Driving more slowly than other traffic is also dangerous because it can increase the risk of a rear-end collision with your vehicle or cause other drivers to swerve to avoid hitting you.

This sign indicates the presence of a pedestrian crossing. Drivers should be cautious when driving where pedestrians may be present.

Warning signs are usually yellow with black markings. This sign alerts drivers to where pedestrians may be crossing. If a pedestrian is crossing in a crosswalk marked with this sign, drivers must stop and remain stopped until the pedestrian is no longer in the crosswalk.

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

Distracted driving is extremely risky behavior that puts not only you and your passengers in danger, but also endangers pedestrians, bicyclists, and other motorists sharing the road. Focused attention on driving helps to prevent crashes.

If a green arrow is shown with a red light, you can only drive in the direction of the arrow and only if the intersection is clear.

You must never attempt to share a lane with a motorcyclist, even if it looks like there is enough room to do so. Motorcyclists need to have a full lane width to be able to maneuver safely.

This sign warns that there is a steep hill ahead.

When approaching an intersection with a steady green traffic light, yield to pedestrians in the crosswalk and vehicles still in the intersection. You may continue driving, but should approach the intersection at a speed that will allow you to slow down and stop if the light changes before you get there.

When approaching this sign, you must yield the right-of-way. Slow down and let vehicles and pedestrians crossing your path pass before you proceed. If necessary, stop before going ahead.

Warning signs are usually diamond-shaped with black markings on a yellow background. They alert drivers to upcoming hazards. This warning sign indicates that drivers are about to encounter a divided highway.

Drivers must respect and cooperate with all other road users and conform to specific rules in order to maintain order and to avoid crashes. When encountering an aggressive driver, it is safest to just get out of their way. Always avoid competing with other drivers.

White lines separate lanes of traffic moving in the same direction. You may cross a dashed white line to pass or change lanes if it is safe to do so.

Drivers of trucks, buses, vans, or any vehicles pulling campers or trailers may not be able to see you if you are driving directly behind them. Increase your following distance when driving behind one of these vehicles. Additionally, large vehicles can block your view of the road, so increase your following distance to look around the sides of the vehicle and see the road ahead.

Always signal your intentions when changing lanes, turning, or pulling away from a curb. Do not allow yourself to become lazy and form the bad habit of not following this law.

If a traffic light at an intersection is not functioning due to a power outage, yield to other drivers in the same manner as you would when approaching a four-way stop. When it is your turn, proceed through the intersection with caution.

Warning signs are usually diamond-shaped with black markings on a yellow background. They alert drivers to upcoming hazards. This sign indicates that the divided highway is about to end.

When parking facing downhill on a road with or without a curb, or when facing uphill on a road without a curb, turn your front wheels toward the edge of the road so your vehicle will roll away from traffic if the brakes fail. However, when parking uphill on a road with a curb, turn your wheels toward the center of the road so the vehicle will roll into the curb if the brakes fail.

Slow down and be prepared to stop whenever you see pedestrians walking on or crossing the roadway. Be particularly careful where children are present. Always yield the right-of-way to a pedestrian crossing in a crosswalk.

You should always turn from the lane that is closest to the direction you want to go. Turn into the lane closest to your previous lane.

It is prohibited to stop, stand, or park on a railroad track. You should never cross railroad tracks unless there is room for your entire vehicle on the other side of tracks.

There are a number of locations where it is unlawful to park, including on a crosswalk or in a marked bicycle lane. When parking on the street, you must be within 12 inches of the side of the road.

You must do everything you can to prevent striking a pedestrian or another vehicle, regardless of the circumstances. It is the driver’s basic responsibility to be alert to pedestrians and to yield the right-of-way to all pedestrians, even if the pedestrian is crossing the street where they should not be.

The flashing overhead lights and stop arm on a school bus will be activated when the bus is stopped to load or unload students. If approaching a bus using these signals, you may not proceed until the red lights have stopped flashing and the stop arm has been retracted. Never pass a school bus that is dropping off or picking up students.

A "Merging lanes" sign indicates that two lanes of traffic going the same direction will soon merge into one lane. Drivers should be ready to either change lanes or allow other traffic to merge into their lane.