Is there any case law where the issue of visibility of a stop sign and illumination of the stop sign overlap?

At trial, I will be in a position to control evidence which unnecessarily overlaps on the issue of visibility and illumination of the stop sign. The experts will be required to confine themselves to their fields of expertise. The evidence will have to meet the criteria for admissibility as set out in R v. Mohan 1994 CanLII 80 (SCC), [1994] 2 S.C.R. 9 (S.C.C.), namely, a properly qualified expert, relevance, necessity to assist the trier of fact, reliability and the absence of an exclusionary rule.