Joshua Carder/Carder Brothers

This detail from an 1881 survey map from LINZ is under Crown copyright. It shows the Clark Pottery and Carder/Cater pottery


and this Google maps image has the locations of the Carder land where Joshua had his works and his sons' Carder Brothers works at Brickbat Bay marked by Lisa Truttman http://timespanner.blogspot.com/2008/12/carder-brothers-waitemata-potteries.html

Just looking at the Google map there does not appear to be an actual road off Scott road to Limeburners, and BrickBat Bay has no public road access either......seems you would need a boat to get there

Scott Road appears to run alongside Carder Bros and product was sent to the city by boat. There's an obvious path or roadway to Clark's pottery in Limeburners Bay and ditto for despatch of product.

Joshua Carder had a path from his house to his pottery (gone now though), clay on site and a jetty to get supplies in and product out. His part of Limeburners Bay was further from the open sea than the other brickworks there. His sons had a long jetty from their site. Plenty of info and photos of this online and in libraries.