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Piedmont Level of Service D Standards 107 <br /> for Other Major Thoroughfares * <br /> 55 MPH 2 Lanes Per Direction 2 Lanes Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 25800 29100 30200 28400 31800 33000 <br /> 11 foot lanes 24900 28100 29200 27500 30800 31900 <br /> 10 foot lanes 24100 27200 28200 26500 29700 30800 <br /> 9 foot lanes 23200 26200 27200 25600 1 28600 29700 <br /> 45 MPH 2 Lanes Per Direction 2 Lanes Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 24600 25500 29300 26800 27600 32000 <br /> 11 foot lanes 23800 24700 28300 25900 26700 31000 <br /> 10 foot lanes 23000 23800 27300 25000 25800 29900 <br /> 9 foot lanes 22100 23000 26400 24100 24800 28800 <br /> 35 MPH 2 Lanes Per Direction 2 Lanes Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 22200 23500 24300 26000 <br /> 11 foot lanes 21500 22700 23500 25100 <br /> 10 foot lanes 20700 21900 22700 24300 <br /> 9 foot lanes 20000 21200 21900 23400 <br /> 25 MPH 2 Lanes Per Direction 2 Lanes Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 22100 24200 <br /> 11 foot lanes 21400 23400 <br /> 10 foot lanes 20600 22600 <br /> 9 foot lanes 19900 21800 <br /> Uses "Principal Arterials" Facility Type in NCLOS <br /> * Decrease in Lane Width Capacity calculated via 2000 Highway Capacity Manual <br /> lane-width adjustment factor for saturation flow rate <br /> See Appendix D1 for HCM 2000 Urban Arterial Equations <br /> Use Appendix D3: Piedmont Major Thoroughfare Inputs for adjustments <br /> NOTE: Lane Width is adjusted downward by 3.33% per less foot of pavement <br /> and rounded to the nearest hundred <br /> 12 Updated 10/14/2011 <br />