The 80mph rise will be disastrous. Claiming that people drive at 80 anyway is a poor arguement as an 80 limit will encourage people to drive at 90, plus...
- Fuel consumption will rise
- CO2, PM10, and NOx emissions will rise
- Noise will increase
- Accidents will increase
I'm usually all for the 80/20 rule but lets stick to the 20 part this time.