Rules of The Road: 11 Essential US Traffic Laws A Driver Must KnowUpdated June 28, 2019
Your state’s driving manual will introduce you to basic driving rules and traffic laws. A complete run-down of all vehicle and traffic laws can usually be accessed on your state’s transportation department website. All drivers must be well-versed in basic traffic laws, as failure to abide by them will create dangerous driving situations and may result in a fine, penalty or suspension of your driver’s license. Traffic laws are not open to interpretation; the law is the law and must be followed to the letter.
It is important to look up basic driving rules and traffic laws in your driver’s manual in addition to working through this summary, as they are not identical in every state. Though most of the main traffic laws are the same, or similar, across the US.
The Basic Speed Rule
Many states – including Texas and California – have what is referred to as the “Basic Speed Law”. This law states that drivers must never exceed a safe speed limit based on current roadway and traffic conditions. Motorists may be cited for breaking this law, even if they are traveling at or beneath the posted speed limit.
Always remember that posted speed limits are based on “ideal” or normal conditions. If driving in bad weather, heavy traffic or some other hazardous situation, drivers must reduce their speed further below the posted limit.
Prima facie speed limits
Exceeding the speed limit is against the law. You must know the speed limit for the road you are driving on, even if there are no posted speed limit signs on the roadway. Each state has general, prima facie speed limits, which apply when there are no speed limit signs posted. Prima facie speed limits are determined by area and road-way type.
Speed limits are very similar around the United States, though there are minor variations. We have included some state-specific examples of prima facie speed limits in our later article: “Speed Limits Across the US”. Do not forget to look up your state’s speed limits in your official driver’s handbook.
Drive on the right
One of our country’s longest standing road laws states that motorists must drive on the right side of the road, to prevent conflict between opposing streams of traffic. Drivers should always keep to the right, unless passing another vehicle, avoiding an obstacle, traveling on a multi-lane road or moving along a one-way street.
Slow traffic must keep right
When there are multiple lanes of traffic moving in the same direction on a roadway, the slowest vehicles should occupy the right-hand lane. This rule also applies on two-lane roads where opposing traffic is not separated by a central barrier. If you must drive slower than other traffic on such a road, you must keep right and travel as close to the curb as possible. The “keep right” rule does not apply when preparing to make a left turn or passing another vehicle.
Stay on the right of the center line
The “center line” separates opposing streams of traffic and may not be in the exact center of the roadway. Motorists must not drive on the left of the center line, except in the following situations:
- Traffic control devices indicate that you may use a lane which is left of the center line, such as a center left turn lane.
- You must avoid an obstruction in the road and can only do so by crossing the center line. Even in this situation you must first yield to any drivers occupying the lane to your left.
- You must cross the center line to make a left turn in to or out of a private road, alley or driveway.
Obey traffic control devices
Drivers must always obey official traffic control devices, including signals, road signs and pavement markings. However, you must disregard traffic control devices if instructed to do so by authorized traffic control personnel, such as police officers, crossing guards or roadway construction workers.
Signal your intentions
Signaling your intention to turn, change lanes or pull out of a parking space is not only safe practice, it is a legal requirement. Most state driver handbooks stipulate that drivers must signal their intention to turn continually for 100 feet prior to the turn, deactivating the signal only once the maneuver is complete.
Maintain a safe following distance
What constitutes a “safe following distance” varies based on roadway and traffic conditions. A distance that is appropriate in one situation may be deemed unsafe in another. All drivers must seek to maintain a safe distance from the vehicle ahead of them, without unduly disrupting the flow of traffic.
Your following distance should be determined by your speed, the number and position of other vehicles on the road, road surface conditions and weather conditions. The drivers of large vehicles such as trucks, recreational motor homes and cars towing trailers must also factor in how much space other vehicles will need to pass them. Maintaining a safe following distance is an issue discussed at length during later articles.
Always execute maneuvers safely
Drivers can be cited for executing a maneuver, if they do so without due caution. Maneuvers that are permitted (or not explicitly forbidden by road signs) can still be “illegal” if the execution of that maneuver endangers road users. Always wait for a safe opportunity to complete any driving maneuver and proceed with caution.
Observe backing up rules
Motorists are not permitted to reverse on roadway shoulders or limited access highways. Never back up if doing so would interfere with or endanger other road users.
Child safety laws
Child safety rules are similar in every state. We explore child safety and restraint laws fully in a later article, though some general rules our outlined here:
Children may not travel on an adult’s lap, as they could be crushed in the event of an accident.
Children must not be left unattended in a vehicle AT ANY TIME.
Children must be restrained with federally-approved, age and size-appropriate car seats.
There are differences in certain laws relating to underage passengers around the United States. For instance, Texas forbids children under the age of 16 to travel in the bed of a pickup truck unless that vehicle is in a parade or on private farm land. Look for state-specific child safety laws in your official drivers manual.
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