Many streets, especially side streets in residential areas, have an extra lane's width on one or both sides for parallel parking. Most minor side streets allowing free parallel parking do not have pavement markings designating the parking lane. Main streets more often have parking lanes marked. Some streets are too busy or narrow for parking on the side. Sometimes parking on the sides of streets is allowed only at certain times. Curbside signs often state regulations about parking. Some streets, particularly in business areas, may have parking meters into which coins must be paid to allow parking in the adjacent space for a limited time. Other parking meters work on a credit card and ticket basis or pay and display. Parking lane markings on the pavement may designate the meter corresponding to a parking space. Some wide streets with light traffic allow "angle parking" or "herringbone parking".