Banff National Park is the top tourist attraction in Alberta, contributing an estimated $6 billion annually to the economy.Attractions include mineral hot springs, mountain scenery, camping, climbing, hiking, golfing, horse-back riding, alpine and nordic skiing, and Lake Louise. Several ski resorts are located within the park: Sunshine Village, Lake Louise Mountain Resort, and Mount Norquay ski resort. A park pass is required for stopping in the park and permit checks are common during the summer months, especially at Lake Louise and the start of the Icefields Parkway. A permit is not required if travelling straight through the park without stopping. The Trans-Canada Highway goes through the park. The death of wildlife on the highway from vehicles is a problem, which has resulted in the highway being fenced off and the construction of wildlife under- and over-passes.