Idaho’s traffic laws regarding right turns on red lights are designed to balance efficient traffic flow with safety for all road users. As of 2025, the foundational rules remain consistent with previous years, but it’s important for drivers to understand the nuances and responsibilities that come with making a right turn on red.
Basic Rule: Right Turn on Red
In Idaho, drivers are generally permitted to make a right turn at a red traffic signal after coming to a complete stop, unless a sign specifically prohibits such a turn. This rule applies to intersections with a steady circular red signal. Before proceeding, the driver must:
- Come to a complete stop at the marked stop line, or if none, before entering the crosswalk or intersection.
- Yield the right-of-way to pedestrians lawfully within an adjacent crosswalk and to other vehicles lawfully using the intersection.
- Ensure that the turn can be made safely without interfering with other road users.
Exceptions and Special Circumstances
- Prohibited by Sign: If there is a posted sign stating “No Turn on Red,” drivers must remain stopped until the light turns green.
- Red Arrow: When a red arrow is displayed, right turns on red are not permitted. The driver must remain stopped until a signal permitting the movement is shown.
- Pedestrian Signals: Pedestrians facing a steady red or red arrow signal are not allowed to enter the traffic lanes.
Left Turn on Red
Idaho is one of the few states that also allows left turns on red, but only under specific conditions:
- A left turn on red is permitted only when turning from a one-way street onto another one-way street, after coming to a complete stop and yielding to other traffic and pedestrians.
- This exception does not apply if a red arrow is displayed or if signage prohibits the maneuver.
Bicycles and Human-Powered Vehicles
Idaho law provides additional flexibility for bicyclists:
- A bicyclist approaching a red light must stop and yield to all other traffic. Once safe, the cyclist may proceed through the red light with caution.
- For right turns, a bicyclist may slow to a reasonable speed, yield as required, and then cautiously make a right turn on red.
- A left turn onto a one-way street is also permitted for bicyclists after stopping and yielding.
Safety and Enforcement
- Complete Stop Required: Idaho law is clear that drivers must come to a full stop before turning right on red. Rolling through the intersection without stopping is a violation and subject to citation.
- Yielding: Drivers must yield to all pedestrians and vehicles with the right-of-way. Failure to do so can result in fines and increased risk of accidents.
- Signage: Many intersections use permanent or illuminated “No Turn on Red” signs to restrict turns during certain hours or conditions. Drivers must observe and obey these signs at all times.
- Penalties: Running a red light without stopping, or making an illegal right turn on red, can result in fines (for example, $90 for running a red light in Boise).
Why the Rule Exists
Allowing right turns on red helps reduce congestion and fuel consumption by minimizing unnecessary idling at intersections. However, this convenience comes with the responsibility to ensure the safety of pedestrians and other vehicles, especially in busy or complex intersections.
Key Takeaways for 2025
- Right turns on red are generally allowed in Idaho after a complete stop and when not prohibited by signs or a red arrow.
- Always yield to pedestrians and oncoming traffic before turning.
- Left turns on red are allowed only from one-way to one-way streets, under the same conditions.
- Bicyclists have specific rules that allow them to proceed through red lights with caution after yielding.
- Strict enforcement and clear signage are in place to ensure compliance and safety.
By adhering to these rules and remaining vigilant at intersections, Idaho drivers can help maintain safe and efficient roadways for everyone.
Sources:
- https://legislature.idaho.gov/statutesrules/idstat/title49/t49ch8/sect49-802/
- https://legislature.idaho.gov/statutesrules/idstat/title49/t49ch7/sect49-720/
- https://en.wikipedia.org/wiki/Turn_on_red
- https://www.achdidaho.org/my-commute/let-s-get-there-safely/stop-on-red
- https://liteonline.com/red-light-law-idaho-2023/
