DELAYS ENCOUNTERED BY TOLL OPERATORS 



561 



100 

 80 



60 

 50 



40 



£ 0.8 



0.6 

 0.5 



0.4 



10 12 14 16 18 20 22 24 26 28 30 32 34 36 



SIZE OF GROUP 



Fig. 14 — Per cent. NC existing and per cent, overflow at various levels of usage. 

 Based on Erlang "B" formula. 



It is interesting to note that each of the proposed Capacity Tables T-1 to 

 T-5 resuhs in a fairly uniform percentage of NC encountered by the operators 

 as determined from the empirical data (Fig. 13) and also a fairly uniform 



