Sight Distance Assessments
Limited sight distance is one of the most common concerns raised at rural intersections. We measure what a driver can actually see in the field and compare it with the stopping and intersection sight distance required by the TAC Geometric Design Guide for Canadian Roads, then recommend the most practical way to close any gap.
Serving municipalities across Ontario from St. Catharines.
What we deliver
- Stopping sight distance on each approach to a stop-controlled intersection
- Intersection sight distance for left-turn, right-turn, and crossing movements from the minor road
- Field measurements at driver eye height, with photographs from each approach
- The cause of any shortfall: vegetation, grade, a crest curve, or a structure
- Recommendations ranging from brush clearing and warning signs to speed limit changes
- Collision history reviewed alongside the measurements
When to assess sight distance
- Resident or council concerns about a specific intersection
- Intersections on crest curves or with a collision history
- Before resurfacing or reconstruction, when improvements can be built with planned work
- As part of a network-wide road safety review
Standards and references
- TAC Geometric Design Guide for Canadian Roads
- Ontario Traffic Manual
Common questions
- What is the difference between stopping sight distance and intersection sight distance?
- Stopping sight distance is the distance a driver needs to see a stop sign or hazard and come to a stop. Intersection sight distance is the clear view a driver stopped on the minor road needs to see approaching traffic and safely turn onto or cross the major road.
- What if the required sight distance cannot be achieved?
- Reconstruction is rarely the first answer. Where sight distance cannot be met, we recommend measures such as advance warning signs, flashing beacons, vegetation clearing, or a reduced speed limit on the major road, supported by the collision history.
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