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A city grid square is a mile square. The following chart is the time in both minutes and turns it would take to drive one mile. This assumes no stopping for light traffic, moderate is 1 1/2 times light traffic, and heavy is twice light.
Light Moderate Heavy MPH time turns time turns time turns 30 2.00 40.00 3.00 60.00 4.00 80.00 35 1.71 34.29 2.57 51.43 3.43 68.57 40 1.50 30.00 2.25 45.00 3.00 60.00 45 1.33 26.67 2.00 40.00 2.67 53.33 50 1.20 24.00 1.80 36.00 2.40 48.00 55 1.09 21.82 1.64 32.73 2.18 43.64 60 1.00 20.00 1.50 30.00 2.00 40.00 65 0.92 18.46 1.38 27.69 1.85 36.92 70 0.86 17.14 1.29 25.71 1.71 34.29 75 0.80 16.00 1.20 24.00 1.60 32.00 80 0.75 15.00 1.13 22.50 1.50 30.00 85 0.71 14.12 1.06 21.18 1.41 28.24 90 0.67 13.33 1.00 20.00 1.33 26.67 95 0.63 12.63 0.95 18.95 1.26 25.26 100 0.60 12.00 0.90 18.00 1.20 24.00
PLEASE NOTE: These times are approximate only. Situational circumstances will change the amount of time necessary to traverse the grid. Below is an approximate guide for what sitations constitute the Traffic Level. The ST can make the player roll their Drive on all occassions to see how the character handles situational circumstances, which would in effect alter the amount of time to traverse one mile, or one city grid.
Time City Area Traffic Type 7 am - 10 am All city Heavy 10 am - 4 pm Downtown Moderate 10 am - 4 pm Suburbs Light 4 pm - 7 pm All city Heavy 7 pm - 10 pm Downtown Light 7 pm - 10 pm Suburbs Moderate 10 pm - 7 am All city Light