a. 



c 



> 

 •s 

 m 



S 



c 



Survey 



b. 



25 41 49 65 47 74 76 54 47 47 28 II 



s 



u 



a. 

 > 





Hour 



n^'^rlV 'l°*'w '^^^''" P^^^ °^ ^^°^ by ^""^^ (*> "'d hour 

 0/ day (b). The May 1993 survey is excluded. 



57 



