stop lines

turn markings

crosswalk lines

lane lines

equal radii and equal widths of pavement

equal radii but pavement width is more at entrance than at exit curve

equal pavement widths but radius is more at entrance curve than at exit curve

different radii and different widths of pavement

circular

elliptical

tangent

turbine

500 vehicles per hour

500 vehicles per day

5000 vehicles per hour

5000 vehicles per day

number of intersecting roads is between 4 and 7

space is limited and costly

when traffic volume is less than 500 vehicles per hour

when traffic volume is more than 5000 vehicles per hour