Simplify the following text for a Grade 6 native English-speaking person.
Original: 5-1-1 , initially designated for road weather information , is a transportation and traffic information telephone hotline in some regions of the United States and Canada . Travelers can dial the three-digit telephone number 5-1-1 on traditional landline telephones and most mobile phones .
Simplified: 5-1-1 is a special telephone number in the United States and some parts of Canada .