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Like any mountainous region, the Italian Alps can be tricky to navigate by car. Roads that look like highways on the map can be narrow and twisting, with steep slopes and cliff-side drops. Generally, roads are well maintained, but the distance covered by all of those curves tends to take longer than you might expect, so it's best to figure in extra time for getting around. This is especially true in winter, when weather conditions can cause slow traffic and close roads. Check with local tourist offices or, in a pinch, with the police, to make sure roads are passable and safe, and to find out whether you need tire chains for snowy and icy roads.
For travel across the French, Swiss, and Italian borders in Piedmont and Valle d'Aosta, only a few routes are usable year-round: the 12-km (7-mile) Mont Blanc tunnel connecting Chamonix with Courmayeur; the Colle del Gran San Bernardo/Col du Grand St. Bernard (connecting Martigny with Aosta on Swiss highway E27 and Italian highway SS27, with 6 km [4 miles] of tunnel); and the Traforo del Fréjus (between Modane and Susa, with 13 km [8 miles] of tunnel). Other passes become increasingly unreliable between November and April.
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