RCS/RCP # 16-025
Article – PD-239.1
Summary – Cone measurement
Proponent – Pleasure Driving Committee
Date Posted – 30Jun15
Change Date – 2016
Status –  Open for comments. Recommended by PDC Jul2015

Current Wording – Article 239 Measurement of Obstacles

239.1 For “traffic cones,” adjustment is made as follows:
a. The track width of each vehicle should be taken at the ground on the widest pair of wheels. The allowance is added and the cones aligned and adjusted from corner to corner. (See illustration below.) 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.
b. If a whiffle tree or splinter bar proves to be too wide for this arrangement, the cones may be adjusted using the whiffle tree’s measurement plus the appropriate allowance, measured at a height on the cone at the same height that the whiffletree is above the ground. (See illustration below.)

New Wording –

239.1 For “traffic cones,” adjustment is made as follows:
a. The track width of each vehicle should be taken at the ground on the widest pair of wheels. The allowance is added and the cones aligned and adjusted from corner to corner. (See illustration below.) 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.
b. If a whiffle tree or splinter bar or the wheel hubs prove to be too wide for this arrangement, the cones may must be adjusted using the whiffle tree’s widest measurement plus the appropriate allowance, measured at a height on the cone at the same height that the whiffletree widest part is above the ground. (See illustration below.)

Reason for change – Clarification for ease of measurement.