City of Oxnard - Bicycle and Pedestrian Master Plan Appendices

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City of Oxnard | Bicycle and Pedestrian Master Plan A.2.7. Grade Separated Overcrossing Design Summary Design Example Preferred Width: 14’ Minimum Design Standard: 12’ minimum width. If overcrossing has any scenic vistas additional width or belvederes should be provided to allow for stopped path users. A separate 5’ pedestrian area may be provided for facilities with high bicycle and pedestrian use. Height: 10’ vertical clearance. Striping: Dashed centerline and shoulder striping should be used. Grade: Ramps should not exceed 5% grade. Discussion Overcrossings require a minimum of 17’ of vertical clearance to the roadway below versus a minimum elevation differential of around 12’ for an undercrossing. This results in potentially greater elevation differences and longer ramps. See following page for additional discussion. Guidance • Caltrans Highway Design Manual (Chapters 200 & 1000) • Caltrans Bridge Design Specifications • California MUTCD • AASHTO Guide for the Development of Bicycle Facilities • AASHTO Guide Specifications for Design of Pedestrian Bridges Preferred Design Alta Planning + Design | A-17
Appendix A | Design Guidelines Additional Discussion – Grade Separated Overcrossing Ramp Considerations: Overcrossings for bicycles typically fall under the Americans with Disabilities Act (ADA), and guidance is included in the Caltrans HDM which strictly limits ramp slopes to 5% (1:20) with landings at 400 foot intervals, or 8.33% (1:12) with landings every 30 feet. Overcrossing Use: Overcrossings should be considered when high volumes of bicyclists are expected along a corridor and: • Vehicle volumes/speeds are high • The roadway is wide • An at-grade crossing is not feasible • Crossing is needed under another grade-separated facility such as a freeway or rail line Advantages of Grade Separated Overcrossing: • Improves bicycle safety while reducing delay for all users • Eliminates barriers to bicyclists Disadvantages / potential hazards: • If the crossing is not convenient or does not serve a direct connection, it may not be well utilized. • Overcrossings require at least 17 feet of clearance to the roadway below involving up to 400 feet or greater of approach ramps at each end. Long ramps must meet ADA requirements. • Potential issues with vandalism, maintenance • High cost A-18 | Alta Planning + Design
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Appendix D | Bicycle Transportation
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City of Oxnard - Bicycle and Pedestrian Master Plan Appendices

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