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103 <br /> Level of Service D Standards for Boulevards * <br /> COASTAL 1 Lane Per Direction 2 Lanes Per Direction 3 Lanes Per Direction <br /> Urban Suburban Rural Urban Suburban Rural Urban Suburban Rural <br /> 55 MPH 21600 21900 24500 43300 43900 49000 64900 65800 73500 <br /> 45 MPH 18900 19800 23600 38100 39700 47200 57200 59600 70800 <br /> 35 MPH 14000 16900 28100 34300 42200 51700 <br /> 25 MPH 12500 1 25400 38400 <br /> PIEDMONT 1 Lane Per Direction 2 Lanes Per Direction 3 Lanes Per Direction <br /> Urban Suburban Rural Urban Suburban Rural Urban Suburban Rural <br /> 55 MPH 19900 20200 22600 40000 40500 45200 59900 60700 67900 <br /> 45 MPH 17500 18300 21800 35100 36600 43600 52800 55000 65400 <br /> 35 MPH 14000 15600 28100 31600 42200 47700 <br /> 25 MPH 12500 25400 38400 <br /> MOUNTAIN 1 Lane Per Direction 2 Lanes Per Direction 3 Lanes Per Direction <br /> Urban Suburban Rural Urban Suburban Rural Urban Suburban Rural <br /> 55 MPH 21600 21900 22300 43300 43900 44500 64900 65800 66800 <br /> 45 MPH 18900 20700 21400 38100 41400 42900 57200 62100 64400 <br /> 35 MPH 14000 18500 28100 37400 42200 56400 <br /> 25 MPH 12500 25400 38400 <br /> Uses "Principal Arterials" Facility Type in NCLOS <br /> *Assumes Regional K and D Factor Averages <br /> See Appendix C1 for HCM Urban Arterial Equations <br /> Use Appendix C2: Coastal Boulevard Inputs for adjustments <br /> Use Appendix C3: Piedmont Boulevard Inputs for adjustments <br /> Use Appendix C4: Mountain Boulevard Inputs for adjustments <br /> NOTE: Inputs assume 12-foot lanes. To adjust lane-width downward, subtract 3.33% per foot of pavement <br /> and round to the nearest hundred <br /> 8 Updated 10/14/2011 <br />