What is a sight triangle?

A sight triangle is a critical area determining visibility at intersections, particularly for vehicles and pedestrians. It helps to ensure that sight lines are clear for drivers approaching or stopping at an intersection, enhancing safety by reducing the likelihood of collisions. The sight triangle is typically formed by two lines extending from the edges of the road and the point where the roadways intersect, creating a triangular-shaped area that must remain unobstructed by vegetation, signs, or structures.

This concept is vital in urban planning and roadway design, as clear visibility can significantly affect decision-making at intersections, particularly at stop signs, traffic signals, or in areas with complex traffic patterns. It is essential for roadway safety and roadway design standards often mandate specific distances for the sight triangle based on speed limits and road classifications. Understanding the importance of the sight triangle helps designers create safer and more functional roadways that can accommodate various types of traffic.