Based on a recent change in Texas Department of Transportation (TxDOT) policy, frontage roads are not to be included along controlled-access highways unless a study indicates that the frontage road improves safety, improves operations, lowers overall facility costs, or provides essential access. Interchange design options that do not include frontage roads are to be considered for all new freeway construction. Ramps in nonfrontage- road settings can be more challenging to design than those in frontage-road settings for several reasons. Adequate ramp length, appropriate horizontal and vertical curvature, and flaring to increase storage area at the crossroad intersection should all be used to design safe and efficient ramps for non-frontage-road settings. However, current design procedures available in standard TxDOT reference documents focus on ramp design for frontage-road settings. The objective of this research project was to develop recommended design procedures for interchange ramps on facilities without frontage roads. This report describes design procedures for interchange ramps on facilities without frontage roads. The procedures described include models for evaluating the operational and safety benefits of alternative ramp configurations. They also include guidelines for designing ramps of adequate length, appropriate horizontal and vertical curvature, and reasonable accommodation of larger vehicles.
Recommended Ramp Design Procedures for Facilities Without Frontage Roads
2004
90 pages
Report
No indication
English
Transportation & Traffic Planning , Transportation , Road Transportation , Urban Administration & Planning , Frontage roads , Ramps , Design criteria , Controlled access highways , Highway transportation , Motor vehicles , Interchanges , Construction , Guidelines , Recommendations , Texas Department of Transportation and Development (TxDOT) , Interchange ramps
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