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Piedmont Level of Service D Standards 106 <br /> for Other Major Thoroughfares * <br /> 55 MPH 1 Lane Per Direction 1 Lane Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 12900 14600 15100 14200 15900 16500 <br /> 11 foot lanes 12500 14100 14600 13700 15400 16000 <br /> 10 foot lanes 12000 13600 14100 13300 14800 15400 <br /> 9 foot lanes 11600 1 13100 1 13600 12800 1 14300 1 14900 <br /> 45 MPH 1 Lane Per Direction 1 Lane Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 12200 12700 14600 13300 13800 16000 <br /> 11 foot lanes 11800 12300 14100 12900 13300 15500 <br /> 10 foot lanes 11400 11900 13600 12400 12900 14900 <br /> 9 foot lanes 11000 11400 13100 12000 12400 14400 <br /> 35 MPH 1 Lane Per Direction 1 Lane Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 11100 11600 12700 12900 <br /> 11 foot lanes 10700 11200 12300 12500 <br /> 10 foot lanes 10400 10800 11900 12000 <br /> 9 foot lanes 10000 1 10400 1 11400 11600 <br /> 25 MPH 1 Lane Per Direction 1 Lane Per Direction WCLTL <br /> Urban Suburban Rural Urban Suburban Rural <br /> 12 foot lanes 11000 12700 <br /> 11 foot lanes 10600 12300 <br /> 10 foot lanes 10300 11900 <br /> 9 foot lanes 9900 11400 <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 /> 11 Updated 10/14/2011 <br />