"We’re working to deliver a safe system which acknowledges that even responsible people can make mistakes on our roads, and that these mistakes should not cost us our lives,” he said. Nine state highways in Northland and two state highways in Auckland are being reviewed after being identified as roads where safer speed limits could make a difference in preventing deaths and serious injuries. The highways being reviewed have been identified as roads where lower speeds could help save lives. “Even when speed isn’t the direct cause of a crash, it is the single biggest factor that determines whether a person is killed, seriously injured or walks away from a crash unharmed,” Mutton said.