Generally, a residential driveway can be 18 feet wide, except where the driveway flares outward at the street. There are provisions for the driveway to be wider directly in front of a garage entrance, depending on the size and orientation of the garage.
Unless the driveway is shared between two adjacent properties, it cannot be located within six feet of a side property line without approval by Town staff or the Town Planning and Zoning Commission, depending on how close the driveway is. Due to the complexity of these regulations, you should consult with the Building Department (285-1960) or Planning Department (285-1980) prior to constructing or modifying a driveway.