The driver of a vehicle having the right-of-way has a right to assume that the driver of a less-favored vehicle will [obey a stop sign guarding the entry to a through highway and] respect the right-of-way of the favored vehicle. This right is one that must be exercised reasonably and not recklessly. Accordingly, the driver of the favored vehicle must keep such look-out for other vehicles, [persons, and things] as a person of ordinary prudence would have under similar circumstances.

The driver of the favored vehicle may not continue to rely upon the foregoing assumption after circumstances arise from which a person of ordinary prudence would conclude that the driver of the less-favored vehicle was about to disregard [the stop sign and] the favored vehicle's right-of-way.

Whether the conduct of the driver of the favored vehicle was reasonable or negligent in the light of what the driver saw or should have seen is a question of fact for you to determine.