In our plan we are going to shift northbound and southbound lanes of US 25 around our activity area using the portion of the road that access Boone Gap. We will create a stop sign intersection at the intersections with US 25 for Boone Gap local traffic. Let's practice one more detail just in case flaggers must be used. If you were planning for a flagger station to stop traffic in both directions, on an as needed basis, the posted speed limit is 55 mph, and our flagger station will be located near the beginning of the transition area, how much clear sight distance must be available? 115 feet 305 feet 495 feet 820 feet