City of Oxnard - Bicycle and Pedestrian Master Plan Appendices
City of Oxnard - Bicycle and Pedestrian Master Plan Appendices
City of Oxnard - Bicycle and Pedestrian Master Plan Appendices
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Appendix A | Design Guidelines<br />
Additional Discussion – Grade Separated Overcrossing<br />
Ramp Considerations:<br />
Overcrossings for bicycles typically fall under the Americans with Disabilities Act (ADA), <strong>and</strong> guidance is included in the Caltrans HDM<br />
which strictly limits ramp slopes to 5% (1:20) with l<strong>and</strong>ings at 400 foot intervals, or 8.33% (1:12) with l<strong>and</strong>ings every 30 feet.<br />
Overcrossing Use:<br />
Overcrossings should be considered when high volumes <strong>of</strong> bicyclists are expected along a corridor <strong>and</strong>:<br />
• Vehicle volumes/speeds are high<br />
• The roadway is wide<br />
• An at-grade crossing is not feasible<br />
• Crossing is needed under another grade-separated facility such as a freeway or rail line<br />
Advantages <strong>of</strong> Grade Separated Overcrossing:<br />
• Improves bicycle safety while reducing delay for all users<br />
• Eliminates barriers to bicyclists<br />
Disadvantages / potential hazards:<br />
• If the crossing is not convenient or does not serve a direct connection, it may not be well utilized.<br />
• Overcrossings require at least 17 feet <strong>of</strong> clearance to the roadway below involving up to 400 feet or greater <strong>of</strong> approach<br />
ramps at each end. Long ramps must meet ADA requirements.<br />
• Potential issues with v<strong>and</strong>alism, maintenance<br />
• High cost<br />
A-18 | Alta <strong>Plan</strong>ning + Design