It is not safe to pull from a stop sign when a vehicle is just 120 feet away. At 25 miles per hour, a vehicle can travel that distance in about one second.
Depends entirely on the size of the vehicle. The average stopping distance for a vehicle is around 160 feet. That includes 51 feet you will travel during your reaction time. And 109 feet braking distance.
[ (242/45) x (the vehicle's average speed in miles per hour) ] feet
ten feet for every ten miles an hour
26 miles = 137,280 feet.
You should be 2-3 seconds behind a given point that the vehicle in front just passed. At 65 mph, that is 95 feet per second, so multiply by 2 or 3 and you should be 190-280 feet behind
Many tornadoes can range from travel, some barley a few feet or yards, some up to 20 miles or more, depending on the tornado. The longest distance a tornado has ever been known to travel was 219 miles.
I'm quite sure there is no emergency vehicle anywhere within which you can travel 300 feet.