摘要: |
The Texas Department of Transportation (TxDOT) sought additional guidance and information to evaluate and design on-street bicycle facilities with emphasis given to retrofit bikeways. TxDOT's role as the administrator of several federally funded programs, including the Statewide Transportation Enhancement Program, the Congestion Mitigation for Air Quality, the Safe Routes to School Program, etc., have placed the agency in the role of evaluating on-street bicycle facility designs for local transportation authorities in the state of Texas. Many local entities are trying to provide an increasing number of facilities for cyclists primarily to convert car trips to bike trips in an attempt to mitigate air quality and congestion problems. The dual problem of poor air quality and high amounts of congestion are endemic to highly developed urban areas where the possibility of expanding the curb-to-curb width of a roadway is often impossible or prohibitively expensive. In this all too common scenario, local transportation authorities have attempted to provide bicycle facilities by reducing space for motor vehicles and allocating it to cyclists without changing the overall width of the roadway. This process will hereafter be referred to as retrofitting and the resulting facility as a retrofit. |