DELAYS ENCOUNTERED BV TOLL OPERATORS 



551 



The curves in Figs. 5 and 6 can also be used to construct new capacity 

 tables which should produce a relatively uniform delay for any size of group. 

 If we select an average delay of three-tentlis of a holding time as an example 



12 14 16 18 20 22 24 26 28 30 



SIZE OF GROUP 



Fig. 8 — Per cent, use with present intertoll trunk schedules and for constant delays based 



on Pollaczek formula. 



and follow the .3 line across these curves, we see that a two-trunk group 



can be kept busy 60.8 per cent, of the time; a three-trunk group can be in use 



about 71.1 per cent, of the time; about 76.7 per cent, for four trunks, etc. 



Figure 8 shows the per cent, usage for groups ot from one to thirty trunks 



