British holidaymakers were trapped after 50-tonne boulder blocked road . Falling rocks cut off ski resorts St Martin , Les Menuires and Val Thorens . Thousands of skiers stranded in a 50-mile tailback in the French Alps . Road was ruled too dangerous for large vehicles to use Friday morning .
British holidaymakers were trapped after 50-tonne boulder blocked road . Falling rocks cut off ski resorts Val Thorens , Les Menuires and St Martin . Thousands of skiers stranded in a 50-mile tailback in the French Alps . Road was ruled too dangerous for large vehicles to use Friday morning .