Marked by green signs, these highways are the primary routes in the system, and Routes 1, 2, 7, 8, 11, 15, 16 and 95 are all expressways or freeways for part or all of their length. The speed limit generally ranges from 80 to 110 km/h (50 to 68 mph), with the highest limits on four-lane freeway sections.[citation needed]
Marked by blue signs, these secondary highways are sometimes the old alignments of primary highways or connector routes between towns or to and from primary highways. The speed limit is generally 80 km/h (50 mph).[citation needed]
Marked by black signs, these are the tertiary routes that fill out the highway network and connect small communities and areas to more important highways. The speed limit is generally 80 km/h (50 mph) or lower depending on road design standards.[13]