This depends on your speed and may depend on what country you live in. Where I live you should travel at a distance suitable for the speed you are traveling.
The rule of thumb is one car length for every 10 miles per an hour that the car you are driving is traveling. For example: You are traveling 70 miles an hour on the interstate, the car you are following should be seven car lengths ahead of you.
the distance/time in which you should be following at behind a vehicle
The minimum following distance behind another vehicle that should be maintained is typically 3-4 seconds. This allows enough time to react in case the vehicle in front suddenly stops or slows down.
When traveling at 55 miles per hour, a good rule of thumb for following distance is to maintain at least one second of distance for every 10 feet of your vehicle's length. Since your vehicle is 30 feet long, you should leave approximately 3 seconds of following distance. This allows for adequate reaction time and helps ensure safety on the road.
Following distance should be increased (more distance) when behind a motorcycle because (1) the MC can stop faster than a car, and (2) it could go down for many reasons. Greater distance decreases the likelihood of running over the MC.
In any driving location, it is generally agreed to be safe if you position yourself 3 seconds or more behind the vehicle in front of you.
When driving in normal conditions on a rural roadway, your following distance should typically be at least three seconds behind the vehicle in front of you. This allows for adequate reaction time in case of sudden stops or emergencies. In adverse conditions, such as rain or fog, you should increase this distance to ensure safety. Always adjust your following distance based on visibility and road conditions.
No
You should follow the two-second rule while driving to maintain a safe following distance behind the vehicle in front of you.
Behind you
Forklifts traveling in the same direction should maintain a safe following distance of at least three forklift lengths apart to allow for ample room to stop safely in case of emergency. Keeping a safe distance reduces the risk of collision and allows for better visibility of obstacles or hazards on the ground.
They say to be about 3 seconds behind the person infront of you. So the faster you move the further back you should be.