Hacker News Reader

Hacker News

Comment by mirimir | Hacker News Reader

Parent Full thread

mirimir

> People think we are the safety hazards. But we're not. We know how to drive defensively.

E=mv^2

Semi: 36000kg

SUV: 3600kg

Compact: 1800kg

Cycle: 360kg

For a semi moving at 100kph, these are the speeds where smaller vehicles would have the same kinetic energy:

SUV: 316kph

Compact: 447kph

Cycle: 1000kph

Just sayin' ;)

View on HN

It doesn't make a difference for your results, but it's

    E = 0.5 mv^2

How embarrassing ;)

They also have a shit load more training than most of the other vehicles you mentioned and generally drive slower.

They'd arguably be safe if they drove at 30kph, in dedicated and isolated lanes. But at 100kph, they are far too dangerous.

...and that's where the conflict with usability comes in. The whole JIT-delivery economy (which is most of the economy, these days) would go down the drain if you suddenly slowed it down three times. Also, 30 kph gets you horrible mileage and emissions with current engines.

Reply on news.ycombinator.com