Practice

A pedestrian phase is being timed for a marked crosswalk across a four-lane undivided arterial with no median refuge. The crosswalk is 60 ft long, curb to curb. The design uses a walk interval of 7 s and a walking speed of 3.5 ft/s for the pedestrian clearance time. The minimum pedestrian phase — the walk interval plus the pedestrian clearance time (flashing DON'T WALK) — is most nearly:

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