Hi folks! I’m trying to track down a mystery film (probably English-language ) I saw many years ago—likely from the 1970s to 1990s. Here’s what I remember:

• The story involves a person who dies in a car accident.
• At first, it’s believed to be a murder, but eventually it’s revealed the person suffered from epilepsy.
• The key plot twist is that the epilepsy was triggered by sunlight flickering through evenly spaced trees lining a rural road—something like a strobe effect as the person drove through.
• This sensory trigger caused a seizure while driving, which led to the accident.
• The roadside had trees planted at equal distances, and the timing of the shadows with the sun being low was critical to the effect.
• The setting was mostly rural, and I think the medical explanation came later as a twist or resolution.

It was a full-length film, not a short or TV episode. Any leads would be amazing—this has been stuck in my head for years. Thanks in advance!