Sight Distance Triangles
A sight distance triangle is an area defined by a driver's line of sight and the location of a visual barrier that is a potential safety hazard.
Drivers need unobstructed horizontal and vertical views within what is called the sight distance triangle to be able to see oncoming traffic from any direction. Good sight distance is critical to reducing the potential for traffic collisions.
*In the graphic, A equals 20 feet and B equals 65’ for streets with a speed limit of 25 mph and under; B equals 100’ for streets with a speed limit of 30 mph or greater.
Utility poles, traffic control devices, trees, and other inanimate objects 18 inches or less in width are permitted when spaced at an adequate distance as to not significantly obstruct the sight distance triangle.
Signs, fences, hedges, shrubs, natural vegetation, trees, and other inanimate objects greater than 18 inches in width are not permitted within the sight distance triangle between 2 and 8 feet above the surface of the intersecting streets.
Homeowners are responsible for keeping sight triangles clear of obstructions on their property and out to the curb on the adjacent street. In 2016, the Washington State Supreme Court confirmed that cities must address these obstructions to keep the roadways in a reasonably safe condition. View the unanimous decision made by the Supreme Court.
If you live on a corner and you are not maintaining the sight distance triangle as required, the City may notify you to take care of the problem by a specific date. If the problem is not resolved within that time frame, the City may impose fines that could accrue on a daily basis until the work is complete.
If you are a homeowner and would like to report completion of requested work, please email a photo of your cleared sight triangle and include your address.