i did 61 miles there sunday and maybe crossed 4 roads - only 1 big road but it had a light - there is also 2 places that have nice restroom facilities and places to refill water along the way - on of those facilities is in the middle of the 42 mile trail (84 mile round trip) so if we were going to do a century ride or a long ride we could park there and use it as sort of a sag stop.
hwy 52 is the crossing with lights
the crossing at 50 is a ramp over the road
the place i was thinking would be good for a sag stop is where you see we did a small circle and there is a parking lot just south of 50
the crossing at powwell road you will see that they take you west a bit so that it is not a busy crossing
here is a map of the ride from motionbased - keep in mind we turned around at 31 miles - there is still another 10 miles or so north and it goes furthuer south than we went down to Lutz Lake Fern Rd
if you choose hybrid you can see the trail a lot better when you zoom in