This circular is a compilation of the contemporary practice that illustrates the basic considerations for spacing standards and guidelines, and that describes current state, county, and local spacing requirements. The spacing of access for driveways and streets is an important element in the planning, design, and operation of roadways.
Access points are the main source of accidents and congestion.
Their location and spacing directly affect the safety and functional integrity of streets and highways. Too many closely spaced street and driveway intersections, for example, increase accident potential and delays and preclude effective traffic signal coordination. Too few inhibit access and over-concentrate traffic. Highway Perspective Spacing should be keyed to the roadway function or access class, operating speed, and development density. Spacing should be more restrictive along higher-type roads, such as strategic and principal arterials.