Do motorway ramp traffic signals help improve travel speeds?

Ramp signals have improved travel speeds on Auckland's Southern Motorway, North Shore councillors were told as they agreed to their use in their city.

But NZ Transport Agency officials could not convince all North Shore City Council members yesterday of the benefits of switching on the first ramp signals for the Northern Motorway from some time between May and August. They were installed on the Southern Motorway in 2007.

The agency's claims of faster travel speeds since and of a 5 to 15 per cent increase in the rate of flow of vehicles were dismissed by councillor Jan O'Connor.

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