This is exactly the experience I’ve had at American national parks. Signs don’t state the time but distance and the envelope drop off is used extensively. This

This is exactly the experience I’ve had at American national parks. Signs don’t state the time but distance and the envelope drop off is used extensively. This is coming from someone that did a road trip through all 48 continental states over a 3 month period and we camped all the time and only stayed in hotels/motels once a week.