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T.P.D.M.V.2.4
4. Using these design figures the parameters in the equation :
CL, a K{F - f q ) can be calculated
E
CO
South Vest North East
q c as circulating flow across entry 1050 900 1400 850
K a 1^.00347(#-30)-0.978(1/r-0.05) 0.965 0.965 0.965 0.965
x^ = v + [(e-v)/(1+2S)] 6.15 9.59 6.15 9.59
M s exp t(D-6G)/103 1.35 U35 1.35 1.35
F = 303 x 2 1863.45 2905.77 1863.45 2905.77
t D - 1 + (0.5/1+M) 1.213 1.213 1.213 1.213
f = 0.210 t n (1+0.2 x 0 ) 0.568 0.743 0.568 0.743
C D 2
Q- = K(F - f q > 1223 2158 1031 2195
E
C C
5. Comparing the entry capacities with the entry flows gives DFC ratios
for the south, west, north and east anus of 65%, 74jt, 58$ and 55f
respectively. The proposed roundabout would hence cater for the
design flows adequately with no queueing. If benefits were to be
obtained in land take etc. a smaller roundabout could be tested.