Practice

On a downtown arterial posted at 35 mph, a work zone shifts both through lanes 12 ft to the left; no lane is closed. The agency applies the MUTCD taper criteria: merging taper at least $L$, shifting taper at least $0.5L$, shoulder taper at least $0.33L$, with $L=WS^2/60$ for speeds of 40 mph or less and $L=WS$ for 45 mph or more ($W$ = offset width, ft; $S$ = speed, mph). The minimum length of the taper at the start of this work zone is most nearly:

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