Vfis evoc test answers9/5/2023 ![]() Some cab over vehicles with short wheel bases can almost turn around in a 50 ft. wide 3 point turn is too easy for some short coupled vehicles with tight cramp angles. Straight line exercise needs to be 6" wider than the maximum width of the widest axle (usually the rear) and the Diminishing Clearance needs to be set at 2" wider (exit end) and 18" wider (entry end) than the widest axle. This won't be realistic for some apparatus with reduced cramp angles, as it will be impossible to fit it into vehicle length plus eight feet limit. You will also find that the offset alley is very difficult with very long rear overhangs. Additionally the offset alley should be lengthened to 52 feet if the wheelbase is greater then 220 inches. ![]() ![]() The width of the course needs to be adjusted for each vehicle width and the serpentine lengthened if > 170" for wheel base. The standard layout for VFIS is designed for a vehicle of 96" out side of tire to outside of tire and a wheelbase (axle center to axle center) 170" or less.
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