At the northern end of Transmission Gully, the new motorway connects with the existing SH1 (Kāpiti Expressway) just north of the Mackays Crossing interchange.
You can get on or off Transmission Gully in either direction using this interchange.
If you’re travelling north on the new motorway (eg from Wellington) and want to get to Paekākāriki, or further around the coastal route, you’ll need to take this exit and then travel south.
Motorists travelling from Kāpiti to Pukerua Bay or Plimmerton, should take the Paekākāriki off-ramp to access the SH59 coastal route (‘old SH1’).
This animated video shows the Transmission Gully motorway route from Mackays Crossing through the Wainui Saddle.