The problem has been an energy source that could tolerate the demands full f.t.l. speed requires.

Higher speeds and/or tighter turns require the motorcycle to lean more.

Higher speeds would require more maintenance and wear it out even faster.

Even moderately fast speeds would have required large leg muscles.

The speed and size of the car requires high driving skills and quick reaction.

However, higher speeds may also require upgrades to the track itself and to grade crossings.

But greater speed requires greater energy, as it does in all other modes of transport.

High speed conventionally requires straight track, introducing a right of way problem in developed countries.

Faster speeds required new commands, leading to a proliferation of command sets in the early 1990s.

Lower speeds could require between 1 and 2 seconds for each knot of wind component.