Answer :
It is true that when driving at highway speeds its safe plan to follow back 4 or more seconds to give you more time to stop your vehicle in emergency stopping situations.
About Vehicle
A vehicle is a piece of equipment used to move people or goods. Vehicles include carts, bicycles, railed vehicles (train lines, trams), powerboats (ships, boats, submersibles), patrol boats (screw-propelled cars, hovercraft), aircraft (aeroplanes, helicopters, aerostats), automobiles (motorbikes, cars, lorries, buses, scooters for disabled people), and spacecraft.
Land vehicles can be generically categorised as wheeled, tracked, railed, or skis depending on how they apply steering and propulsion forces to the ground. The international standard for types, terminologies, and definitions of road vehicles is ISO 3833-1977.
To know more about highway speeds:
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