Definition of main road:
(n) :
A major road in a town or village, or in a country area.
(n) :
(Northeastern US, UK) A major urban road, off which lead many smaller streets, many of them cul-de-sacs.
(n) :
(in some countries) A priority road; a road where entering traffic must yield right of way.
(n) :
(South Africa) High Street; Main Street