Sun Glare - Expert Tasked with Evaluating Visibility Conditions Expert Article

On a sunny afternoon, a driver turned left from a stop sign and a short distance later struck a pedestrian. The driver claimed that his turn and irregular shadows from city buildings suddenly exposed him to sun glare that prevented him from seeing the pedestrian.

Dr. Raymond Lee, PhD, an expert in meteorology and visibility in adverse weather conditions, was retained on behalf of the plaintiff to evaluate visibility conditions at the time of the incident. As part of his analysis, Dr. Lee calculated:
  1. the angle between the sun and driver’s line of sight and
  2. the amount of sun glare possible at that angle.
Dr. Lee determined that although this glare would have reduced the pedestrian’s contrast, there still would have been enough contrast so that the driver should have detected the pedestrian in time to avoid a collision.

Featured Expert

Raymond L. Lee, Meteorologist & Visibility Expert

Raymond L. Lee, Ph.D.

Meteorologist & Visibility Expert
Dr. Lee is an expert in determining weather conditions at a particular time and location, how weather and ambient conditions affect human vision, and how weather events affect other incidents such as… read more.

Related Articles

View All Articles

Driver Visibility in Adverse Weather - Expert Report (Redacted)

By Raymond L. Lee
Expert Article

For this predawn two-vehicle crash, involving a loader crossing the road and a SUV on the through road, the crash site was reported to have been dark with no streetlights. Eyewitnesses variously…

Rainfall Analysis - Forensic Meteorologist Report

By Raymond L. Lee
Expert Article

In this particular case, the plaintiff and her party had reported rain during their approach to the crash site. Yet, the nearest recording stations just showed a trace of rain. With the application…