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8 <br /> Level of Service D Standards for Rural 2-Lane Highways <br /> Coastal 2-Lane COASTAL <br /> Highway Standard Minimum Standard Maximum <br /> 12-Foot Lanes 10500 12700* <br /> 11-Foot Lanes 10000 14700*# <br /> 10-Foot Lanes 9200 12000 <br /> 9-Foot Lanes 7700 10700 <br /> Piedmont 2-Lane PIEDMONT <br /> Highway Standard Minimum Standard Maximum <br /> 12-Foot Lanes 10300 12400* <br /> 11-Foot Lanes 9900 14300*# <br /> 10-Foot Lanes 9000 11800 <br /> 9-Foot Lanes 7500 10500 <br /> Mountain 2-Lane MOUNTAINS (Level) <br /> Highway Standard Minimum Standard Maximum <br /> 12-Foot Lanes 10200 <br /> 11-Foot Lanes 9800 12100* <br /> 10-Foot Lanes 8800 11700 14000*# <br /> 9-Foot Lanes 7400 10300 <br /> Mountain 2-Lane MOUNTAINS (Rolling) <br /> Highway Standard Minimum Standard Maximum <br /> 12-Foot Lanes 9600 12100* <br /> 11-Foot Lanes 9100 14000*# <br /> 10-Foot Lanes 8200 11100 <br /> 9-Foot Lanes 6300 9800 <br /> Uses"2-Lane Highways" Facility Type in NCLOS <br /> *All capacities calculated based on HCM 2000 procedures using HCS software. Under some conditions, <br /> two-lane highway capacity is not affected by lane width.This occurs where capacity is governed by <br /> Percent Time Spent Following rather than by Average Travel Speed. <br /> #Best-case/Maximum conditions are less likely to occur where lane widths are below 11 feet. <br /> Use caution before selecting "Maximum"values for 9-ft or 10-ft lanes. <br /> See Appendix Fl for HCM 2000 2-Lane Highway Equations <br /> Use Appendix F2: Coastal Rural 2-Lane Highway Inputs for adjustments <br /> Use Appendix F3: Piedmont Rural 2-Lane Highway Inputs for adjustments <br /> Use Appendix F4: Mountain (Level) Rural 2-Lane Highway Inputs for adjustments <br /> Use Appendix F5: Mountain (Rolling) Rural 2-Lane Highway Inputs for adjustments <br /> 18 Updated 10/14/2011 <br />