The Commercial Drivers License (CDL) Study Guide

Glare

Avoid blinding others.

Glare from your headlights can cause problems for drivers coming towards you. They can also bother drivers going in the same direction you are, when your lights shine in their rearview mirrors. Dim your lights before they cause glare for other drivers. Dim your lights within 500 feet of an oncoming vehicle and when following another vehicle within 500 feet. Avoid glare from oncoming vehicles. Do not look directly at lights of oncoming vehicles. Look slightly to the right at a right lane or edge marking if available. If other drivers don’t put their low beams on, don’t try to “get back at them” by putting your own high beams on. This increases glare for oncoming drivers and increases the chance of an accident.

Use high beams when you can. Some drivers make the mistakeof always using low beams. This seriously cuts down on their ability to see ahead. Use high beams when it is safe and legal to do so. Use them when you are not within 500 feet of an approaching vehicle. Also, don’t let the inside of your cab get too bright. This makes it harder to see outside. Keep the interior light off and adjust your instrument lights as low as you can and still read the gauges.

If you get sleepy, stop driving at the nearest safe place. People often don’t realize how close they are to falling asleep even when their eyelids are falling shut. If you can safely do so, look at yourself in a mirror. If you look sleepy, or you just feel sleepy, stop driving! You are in a very dangerous condition. The only safe cure is to sleep.

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This site is meant to enhance your learning of the Rules of the Road and is not intended to replace the Drivers Manual supplied by the Motor Vehicle Department of your State. Send mail to web master with questions or comments about this web site.

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