In the majority of U.S. states, traffic law follows a shared rule: drivers should remain in the right lane unless actively passing another vehicle.

This rule applies regardless of:

• Driving the speed limit
• Light traffic conditions
• Personal judgment of “fast enough”

Speed does not override lane usage laws.

Most states explicitly require slower-moving traffic to stay in the right lane when not passing. These laws often use language such as “slower traffic keep right” or “do not impede traffic flow.”

Common examples include:
California, Texas, Florida, Pennsylvania, Ohio, Georgia, North Carolina, Virginia, New Jersey, and Arizona.

In these states, remaining in the left lane while blocking faster traffic may result in a traffic citation.

Several states go further by legally designating the left lane as a passing lane only on highways and interstates.

Examples include:
Colorado, Utah, Montana, Washington, Oregon, Kansas, and Maine.

In these states, law enforcement may stop drivers solely for left lane camping, regardless of speed.

Typical exceptions include:

• Preparing for a left exit or turn
• Heavy congestion
• Emergency vehicles or road hazards
• Construction zones or lane closures

Not valid exceptions:

• Driving the speed limit
• Enforcing personal speed rules
• Avoiding lane changes

Left lane laws exist to promote traffic flow and reduce congestion. Research shows left lane misuse contributes to:

• Increased braking
• Traffic congestion
• Road rage incidents
• Higher accident risk

Passing lanes are designed to keep traffic moving efficiently, not to regulate speed.

• Pass, then move right
• Let faster traffic pass
• Don’t police other drivers
• Use the left lane intentionally
• Traffic flow beats ego