Colmar-sur-Mer to Exeter: Ultimate Road Trip Guide

The D940 coastal road from Colmar-sur-Mer to the A84 motorway offers a surprising geological anomaly: the shoreline here is one of the few places in Normandy where Jurassic-era limestone meets Cretaceous chalk, creating a paleontological jackpot. This route covers roughly 340 kilometers (211 miles) and typically takes 3.5 to 4 hours of driving time, excluding stops.

For the best stops from Colmar-sur-Mer to Exeter, plan to break the journey at the Mont-Saint-Michel bay or the medieval city of Dinan. The A84 and A84-E401 corridor is well-maintained, but the final approach to Exeter involves the A38 dual carriageway, which can clog near rush hour. If you're wondering how long to drive Colmar-sur-Mer to Exeter, budget 5–6 hours total with breaks.

Is it worth driving Colmar-sur-Mer to Exeter? Absolutely—the route stitches together two distinct landscapes: the Breton ruggedness and the lush Devon countryside. For hidden gems on this corridor, how to find the best stops and hidden gems between cities is a useful resource. The drive offers a contrast of tidal flats, apple orchards, and historic market towns.

The D940 unfolds a panorama of the Bay of Mont-Saint-Michel, with its shifting tides and sandbanks. The A84 cuts through the Normandy bocage—hedgerows and dairy pastures. After the ferry, the A38 crosses the Blackdown Hills (Area of Outstanding Natural Beauty), offering views of rolling green hills and red sandstone cliffs.

• UNESCO site: Mont-Saint-Michel (near Avranches).
• Natural Attractions: Pointe du Grouin (cliff walk), Dartmoor National Park (detour 30 min).
• Climatic conditions: Mild maritime; pack rain gear for Brittany and Devon.

Local commerce along the route includes oyster farms at Cancale (buy direct at stalls), cider producers in the Pays d'Auge, and Exeter's farmers' market (Thursdays). For a unique stop, the village of Saint-Suliac has a medieval market square.

• Must-try: Cancale oysters with Muscadet wine.
• Hidden off-route spot: Château de la Rivière-Drugeon (15 min detour, Renaissance gardens).

Road quality is high on both sides: A84 is smooth, well-lit, with emergency phones. In the UK, the A38 has average traffic; sections near Exeter can be congested. Speed limits: France 130 km/h (80 mph), UK 70 mph (113 km/h). Radar traps are common on A84.

• Safety tips: Watch for roaming livestock on D940; in Devon, deer crossings.
• Pet-friendly: Saint-Malo ferry allows pets in vehicles; rest stops with dog areas at Aire de la Baie.

Family-friendly stops include the Parc Zoologique de Champrepus (near Villedieu-les-Poêles) and the aquarium at Saint-Malo. For fatigue management, take breaks every 2 hours at designated rest areas (e.g., Aire de Bréhal on A84).

• Rest zones: Aire de la Pointe du Roc (scenic viewpoint), Exeter Services (food court).
• Child activities: Miniature train at Dinan, beach at Saint-Malo.

The primary route from Colmar-sur-Mer follows the D940 east to the A84 motorway near Avranches, then the N175 to the ferry port at Saint-Malo. The crossing to Portsmouth is operated by Brittany Ferries (3 hours), followed by the A3(M) and A38 to Exeter. Total driving time on land is about 2.5 hours, plus 3 hours at sea.

• Road numbers: D940 (coastal), A84 (toll-free motorway), N175, A38 (UK).
• Tolls: The A84 is toll-free; UK roads are toll-free except for the Dartford Crossing (detour).
• Ferry booking: Advance booking advised; day tickets from £50–100.

Fuel stops are plentiful: major stations at Avranches, Saint-Malo, and on the A84. In the UK, services on the A38, like Exeter Services, are 24/7. For fuel economics, diesel is cheaper in France (approx. €1.60/L) than UK (£1.50/L). A full tank covers the entire land journey.

• Best fuel stop: Leclerc Avranches (€1.55/L diesel).
• Electric vehicle (EV) charging: Fast chargers at Saint-Malo ferry terminal and Portsmouth port.