Turning the dial to the left, decreases the toll to $0 and this causes increased vehicle congestion and travel time. The graph represents this by displaying an increased amount of vehicle icons moving slowly across the page.
Turning the dial slightly to the right, increases the toll cost but decreases congestion and travel time. The graph displays less vehicle icons moving across the page at a faster pace.
As the toll approaches $16, the commute times become much faster. Travel by public transportation and bicycle increases. 
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