Calls for harsher punishments for drivers who seem undeterred by speeding fines

A study's found drivers who've received speeding tickets - are three times more likely to be in a crash than people not ticketed.

Speed was a factor in a third of fatal crashes last year.

Canterbury University's Darren Walton says the fine regime hasn't changed since 1999.

He says it's possible to retain a licence with four to five tickets over a two-year period - and that's an extraordinary risk.

Walton says he'd increase the fines, but demerits are another option.