Tollguru™ considers the following factors to calculate tolls for your vehicle
For roads where truck tolls are based on weight and height, Tollguru™ uses a relationship between weight, height
and number of axles to calculate tolls. Please refer to individual state pages to see
truck toll payment information for your state.
If a method of payment cannot be used throughout a route, it is shown as
Link: http://tollguru.com/faq/how-does-toll-calculator-calculates-tolls