The width of obstacles is generally determined by the width or tread of the vehicles, not the size of the animals.
- Width of wheel base of vehicle to be measured by show management. The track width of each vehicle should be taken at the ground on the widest pair of wheels.
- Obstacle spacing is to be as follows:
- Wheelbase = Obstacle Spacing
- 60 inches or over = not over 14 feet
- 59 inches-44 inches = not over 12 feet
- Under 44 inches = not over 9 feet
- The allowance is added and the cones aligned and adjusted from corner to corner. (See illustration) This allows the greatest distance between the corner of the base and the upright portion of the cone. The taper of the cone provides clearance for normal hubs or whiffle trees or splinter bars.
- If a whiffle tree or splinter bar or the wheel hubs proves to be too wide for this arrangement, the cones must be adjusted using the widest measurement plus the appropriate allowance, measured at a height on the cone at the same height that the widest part is above the ground.
- On markers with perpendicular sides, adjustment for the widest part of the vehicle at the highest part of the cone may be made.
- Care should be taken when numbers are placed to ensure that the numbers do not protrude inside the markers where they might be disturbed without hitting the obstacle itself.
- It is the responsibility of the Steward to ensure that each set of markers is properly adjusted.
- Obstacle spacing is to be as follows: