Indiana’s new turn-signal rule: how far you must signal before a turn or lane change

Indiana now requires drivers to signal continuously for at least 200 feet before turning or changing lanes, and for at least 300 feet where the posted speed limit is 50 mph or higher. The clarified rule, codified in Indiana Code 9-21-8-25 and updated effective July 1, 2023, makes clear that the distance requirement applies not only to turns but also to lane changes, and it must be followed even when you believe no other traffic is nearby.

What changed, and when

For years, Indiana law required a continuous turn signal before turning, and drivers also had to signal when changing lanes. But the statute’s wording created debate over whether the 200-foot (or 300-foot) distance requirement applied to lane changes, too. An amendment to Indiana Code 9-21-8-25 that took effect on July 1, 2023, removed the ambiguity by explicitly requiring the same continuous-signal distances before both turns and lane changes. Separately, Indiana’s Supreme Court has held since 2018 that signaling is required even when no other traffic is present, reinforcing that this is a universal obligation, not a conditional one.

What the law requires, in plain terms

Signal distances

Before you turn or change lanes, you must activate your signal and keep it blinking continuously for a minimum distance. On roads with a posted speed limit under 50 mph, that minimum is 200 feet. Where the posted limit is 50 mph or higher, the minimum is 300 feet. The measurement is based on the posted speed limit for that stretch of road, not your actual speed.

Situations where you must signal

The updated statute applies to any intentional movement right or left upon a roadway. That includes more than just classic left or right turns; it covers a range of everyday maneuvers.

• Turning at intersections, into driveways, or into alleys.
• Changing lanes on multi-lane roads and interstates.
• Merging onto or off of highways, including moving onto entrance or exit ramps.
• Exiting a roundabout (use your right signal before your exit).
• Pulling away from or toward the curb, including parallel-parking maneuvers.
• Any lateral movement that changes your position within or between lanes.

Treat each of these as a movement that requires clear, advance communication to other road users by signaling continuously for the required distance.

How to signal correctly

Complying with the law is straightforward, but consistency matters. These steps reduce your risk of a traffic stop and improve safety.

1. Activate your signal early enough to cover the full 200 or 300 feet before the maneuver begins.
2. Keep the signal on continuously until you complete the turn or lane change—do not rely on a brief flicker.
3. Check mirrors and blind spots; the signal communicates intent, not a right-of-way guarantee.
4. Complete the maneuver and ensure the signal cancels; manually cancel it if necessary.
5. If your signal lamps are inoperable or your vehicle lacks them, use proper hand-and-arm signals, and repair equipment promptly as required by vehicle safety rules.

Applied consistently, these habits both satisfy the statute and give other drivers predictable cues about your movements.

Enforcement and penalties

Failure to signal as required is a traffic infraction in Indiana and provides lawful grounds for a traffic stop. Penalties typically include a fine and may lead to Bureau of Motor Vehicles points and higher insurance premiums; exact fines and point assessments can vary by county and by the BMV’s current schedule. Because the law requires signaling regardless of traffic presence, “no one was around” is not a defense.

Frequently asked details

Does the 300-foot rule apply on interstates?

Yes. If the posted speed limit is 50 mph or higher, you must signal continuously for at least 300 feet before a turn or lane change, including before exiting on ramps or moving between lanes.

Do I have to signal if no one is around?

Yes. Indiana’s courts have made clear that signaling is required even when you believe no other traffic is present. The obligation is universal, not conditional.

What about roundabouts?

Use your right turn signal before you exit a roundabout. You do not need to signal simply to enter or circulate, but signaling your exit is required because it is a rightward movement from the circulatory roadway to the exit lane.

Are hand signals legal?

Hand-and-arm signals are permitted when a vehicle’s signal lamps are not functioning or are not equipped, but vehicles must generally have and maintain operational turn signal lamps under equipment rules. Consider hand signals a temporary fallback, not a substitute for repairs.

Bottom line

Indiana’s updated turn-signal law requires a continuous signal for at least 200 feet before any turn or lane change—extended to 300 feet where the posted limit is 50 mph or higher. It applies in all conditions, including when roads appear empty, and covers lane changes, merges, and roundabout exits. Signaling early and continuously is both the legal requirement and the safest practice.

Summary: Signal every turn and lane change, keep it on for 200 feet (or 300 feet at 50+ mph), and maintain the signal continuously until the maneuver is complete—no exceptions for “no traffic.”

Are you legally required to use your turn signal?

Blinkers and Hand Signals
Western states also mandate using a turn signal before changing lanes. Some states, such as California and Idaho, require drivers to signal five seconds before switching lanes to give anyone in traffic around you time to react.

What is the turn signal law in Indiana?

You must give a proper turn signal before turning or changing lanes. The safest type of signal is using the lighted signals used in most vehicles. If, however, one or more of these signals is malfunctioning, you may use hand signals. You may not use hand signals on a driving skills exam.
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What is the new driving law in Indiana?

Indiana’s new Hands-Free Law prohibits the use of hand-held telecommunication devices such as cell phones and tablets while driving, unless used in conjunction with hands-free technology.

What is the new rule for senior drivers in Indiana?

Indiana: Renew license every three years for 75–84; every two years for 85 and older. Vision test requirement: Every renewal for 75 and older.