You are right Mike the flicker of light through trees etc (strobe effect) can be very dangerous for some people it can induce tiredness and even cause drivers to fall asleep at the wheel and as you say epileptic’s are prone to fits in this situation.
In NZ we have to endure a very low angle of morning sun and a lot of accidents are put down to this, we call it “Sun strike” last Wednesday we decided to have a day out at Taupo and due to my Eye condition I am restricted to a 45k radius from home and no city driving so I usually take the first and last bit of a trip and my wife has to do the rest, any way we start off about 9am, sky is overcast just the ideal condition for me but wouldn’t you know it after about 10k out comes the sun and 90% of the time it is dead ahead, after a couple of strays over the centre line I just had to give the wheel to the missus. That lucky old sun has nothing to do but roll around heaven all day. grrrrrr