14 



John B. Calhoun 



Table lb 



Probability of Terminating Trips with Respect to Environmental Structure 



AND Level of Activity 



Alley 



Secondary condition 



Expected number of 

 trips terminating at: 



A^,-i 



A^i 



Mean 



During first 2.5 hr. of hyper- 237.5 194.3 0.182« 



activity 

 Unstructured . 182 



During normal nocturnal ac- 510 417 0.182° 



tivity 



Structured 



Paper transportation 

 Food transportation 



999 



783.3 0.261 



837 653.5 0.220 



0.240 



" The mean b value of —0.20115 used in the calculation of p. 



1000 



i 100 



50 



10 



DISTANCE FROM HOME IN FEET 



Fig. 5. Theoretical curves depicting relative likelihood of trips going beyond suc- 

 cessive distances from home based upon an initial 1000 departures. A, in an unstructured 

 alley (see Fig. 3) ; B, in an alley structured with objects available for transport back 

 home. 



