One of the strongest supporters of the Mackays to Peka Peka Expressway has been Otaki MP Nathan Guy.
Mr Guy was a guest speaker during a ceremony held on the new Waikanae River bridge on Thursday morning to mark the completion of the expressway.
Mr Guy, who helped cut a ribbon to celebrate the occasion, said there had been talk of a Sandhills motorway, since the 1940s, from Johnsonville to Foxton, but over time various council's had taken the designation off except for the Kapiti council.
Over time the Paraparaumu and Waikanae communities had grown a lot but the connectivity, namely State Highway 1, had been poor.
"So this project is hugely important for our communities."