Consider how much space you do need ahead for safe travel as a pedestrian, on a bicycle, on an interstate highway in a car, or on a plane taking off at an airport, and you have the answer.
Cars already require a ridiculous amount of space for safety. I live in Germany and there are cities with 200,000 inhabitants that are smaller in area than a single highway intersection.
Consider how much space you do need ahead for safe travel as a pedestrian, on a bicycle, on an interstate highway in a car, or on a plane taking off at an airport, and you have the answer.
Cars already require a ridiculous amount of space for safety. I live in Germany and there are cities with 200,000 inhabitants that are smaller in area than a single highway intersection.