Larger gaps are going to increase the length of the line of cars. Somewhere downstream that is quite likely to have side-effects unless the road is infinitely long with no entry points. Perhaps it does not cause any problems on a long motorway, but cars do have to come in from somewhere.Now consider the alternative. Everybody maintains a safer following distance, keeping their vehicles in motion, saving fuel, reducing the risk of bumper bashings and wear on their engines - would people be happier with this even if it creates an extra 500m (ballpark figure) of slow moving traffic as opposed to 500m less of motionless traffic? I know I would.
What would be preferable is travelling at a steady slow speed, but as close as possible to the vehicle in front. More impact risk, but keeps the fuel consumption down, the traffic flowing smoothly and increases the number of vehicles that can get onto the road.
That's no better. People who lack the motor skills to pull away near simultaneously with the person in front of them probably shouldn't be allowed to drive. Same for people who don't pull away from traffic lights as briskly as their car can manage. Well actually this is fine when there are no cars waiting behind you, but a big deal during heavy traffic periods.and pull off 10-20 seconds later
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