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TOLL ROADS AND FREE ROADS
![Plate 23](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Toll_Roads_and_Free_Roads_Plate_23.png/400px-Toll_Roads_and_Free_Roads_Plate_23.png)
Plate 23.— Relation of average daily traffic volume during year to both maximum 24-hour traffic volume during year, and average 24-hour traffic volume during month of maximum traffic.
![Plate 24](http://upload.wikimedia.org/wikipedia/commons/thumb/5/56/Toll_Roads_and_Free_Roads_Plate_24.png/400px-Toll_Roads_and_Free_Roads_Plate_24.png)
Plate 24.—Relation between maximum hourly traffic volume and average 24-hour traffic volume.