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Caroline County, Virginia, Highway Corridor Overlay - District proviions strongly discourage access drives to I individual sites within the corridor. The ordinance gives 1 • preference to shared entrances, access to other streets, and f internal service drives. Driveway spacing regulations developed by the Tri- - County Regional Planning Commission in Lansing, )�` I Michigan, set minimum spacing standards on the basis /,\ of arterial highway operating speeds. The performance ' 1 standards, which have been implemented by a number -------- '-- - -- of Lansing area communities, establish minimum drive- way spacing standards according to the following schedule: ) ,` ', Highway Speed Limit Minimum Spacing (Feet) \ /r1, 25 mph 105 30 125 ' 35 150 40 185 I Highway Research Board 45 230 50 275 The use of frontage roads is not a good method of controlling direct access to arterial streets, a total of 60 major conflict In addition to these requirements, the access standards points are created at intersections when service roads line both also establish minimum sight distance criteria for drive- sides of an arterial highway way placement and driveway profile design guidelines. Excerpts from the Tri-County standards are included in the appendix to this report. and temporary drives can be closed and consolidated into Parallel service drives represent an underused, yet via- one or two access points. The type of facilities recom- ble alternative to the location of numerous private drive- mended in the Rensselaer County manual should not be ways along the road frontage of an urban corridor. A confused with actual frontage roads, which may increase guidebook for developers and municipalities developed traffic congestion and accident potential at major inter- • by the Rensselaer County, New York, Bureau of Planning sections along the corridor. recommends the construction of short service roads par- Even those ordinances that do attempt to address cor- allel to heavily traveled arterial roads in the county. The ridor traffic circulation and safety concerns often do so strategy calls for small sites to be served by individual in an ad hoc way by resolving driveway access issues on driveways until adjacent lots are developed. At that time, a case-by-case basis. The result is a process that ignores a service road can be constructed to serve multiple lots traffic engineering considerations by allowing proposed Cr 4,,,,, The absence of landscape features and curbs makes it extremely difficult to identify where the public roadway ends r. ! :-_.: .,%__ and the private parking lot begins. Such y, `" situations are not only ugly, they are also unsafe - - - — k 1 rrte, 4 - i - w iD ,- Priff ID _ - ... ill 7- 19