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The 100-Series Highways are a series of arterial highways in the Canadian province of Nova Scotia.

A 100-series highway is a designation applied to a highway that can be a controlled-access expressway, Super-2, or fully-divided freeway. The designation can also be applied in some cases to sections of uncontrolled access roads which are deemed strategically important and which will be upgraded in the future to controlled-access.

These highways connect major population centres such as the Halifax Regional Municipality and Cape Breton Regional Municipality with smaller population centres such as Yarmouth, Truro and Amherst, as well as the neighbouring province of New Brunswick.

Some of the 100-series highways also carry the Trans-Canada Highway designation on their routes.

The typical naming convention is to add 100 to a route containing a local trunk highway. Eg. Trunk 3 is a local trunk highway and Highway 103 is the 100-series highway running parallel to Trunk 3 in this corridor.

A 100-series freeway is roughly equivalent in function to the 400-Series Highways of Ontario, Autoroutes of Quebec, or the Interstate Highway System of the United States, albeit on a much reduced scale and amount of traffic. Many of these highways were developed during the 1960s-1990s as political projects and proved detrimental to rural railway service in the province, resulting in many rail line abandonments.

• · Highway 101 -- Dartmouth Bedford - Kentville - Digby - Yarmouth
• · Highway 102 -- Halifax - Highway 104 interchange at Onslow (north of Truro)
• · Highway 103 -- Highway 102 interchange at Halifax - Bridgewater - Barrington Passage - Yarmouth
• Highway 104 - Trans-Canada Highway -- New Brunswick border - Amherst - Truro - New Glasgow - Antigonish - Canso Causeway - St. Peters (TCH designation only between Canso Causeway-N.B. border)
• Highway 105 - Trans-Canada Highway -- Canso Causeway - Baddeck - Marine Atlantic ferry terminal at North Sydney (to Newfoundland)
• Highway 106 - Trans-Canada Highway -- Highway 104 interchange at Westville - Pictou - Northumberland Ferries ferry terminal at Caribou (to Prince Edward Island)
• · Highway 107 -- Burnside Drive in Dartmouth - Porters Lake - Musquodoboit Harbour
• · Highway 111 - Circumferential Highway -- Pleasant Street Woodside, Nova Scotia - Dartmouth - A. Murray MacKay Bridge to Halifax
• · Highway 113 - planned -- Highway 102 interchange at Bedford - Hammonds Plains - Highway 103 interchange at Hubley
• · Highway 118 -- Victoria Road in Dartmouth - Highway 102 interchange at Miller Lake
• · Highway 125 -- Highway 105 interchange at North Sydney - Sydney
• · Highway 142 -- Highway 104 interchange at Salt Springs - Springhill
• · Highway 162 -- Highway 105 interchange at Bras d'Or - Point Aconi

Historical Note: Nova Scotia's original arterial highway number system had route number signs in the same shape as the U.S. Highway route number signs. These signs are now used for trunk highways.

Nova Scotia is planning to convert many 100-series highways to divided 4-lane highways during the 21st century, pending availability of funding.

• List of Nova Scotia provincial highways

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100-Series Highways of Nova Scotia

Expressways and Freeways Highway 101 • Highway 102 • Highway 103 • Highway 104 • Highway 105 • Highway 106 • Highway 107 • Highway 111 • Highway 113 • Highway 118 • Highway 125 • Highway 142 • Highway 162

See Also: List of Nova Scotia provincial highways • Quebec Autoroutes • New Brunswick Expressways • Trans-Canada Highway Roads in Canada