The Mont Blanc Tunnel links Chamonix, France to Courmayeur Aosta Valley, Italy via a 11.6 km tunnel.
Cars: one-way: €35.10, return: €43.70
Motorbikes one-way: €23.20, return €29.10
Camping cars one-way: €46.40, return €58.30
There are also substantial discounts for buying more journeys: more info here
The tunnel is very heavily monitored by cameras relaying images to the control room. As this is an international border, there are customs posts at both entrances. The minimum speed limit is 50km/h and the maximum speed limit is 70km/h. In addition, vehicles are expected to maintain a distance of at least 150m between each other.
There is a time delay on cars leaving the péages (toll booths) and signs to remind drivers to respect the speed limits and safe distances. Failure to respect these limits will incur severe, on the spot, fines or even a suspension of your licence.
Driving dangerously close to the car in front could cost you €135 or even your licence. Failure to observe the speed limit could cost you between €90 and €750 and you can expect to lose your licence on the spot when you pay a fine of €750.
**Non-French and Non-Italian drivers must pay the fines on the spot. French & Italian drivers have a month to pay or they can pay up straight away.