decars1-9, Exercise 2: The two sides

Model answer (check the details; positions change):

For a general limit:
- Safety: lower speeds reduce the severity of crashes and the number of deaths and injuries.
- Climate and noise: lower speeds cut fuel use, carbon dioxide emissions and noise.
- Polls: surveys have often found a majority in favour.
Statistics relied on: crash severity by speed, studies comparing limited and unlimited stretches, and emission estimates.

Against:
- The Autobahn is already among the safest road types per kilometre driven, because there are no oncoming vehicles and no crossings.
- A limit would restrict freedom for a small safety and climate gain, and the effect on emissions is modest compared with other measures.
- The unlimited stretches are a matter of national habit and pride.
Statistics relied on: deaths per billion kilometres by road type, and estimates of emission savings.

Note: the positions of the motoring club ADAC and of the political parties have shifted over time, so each should be dated and sourced.