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3.4.2.1 Bottom Car Runby
The bottom car runby shall be
(a) not less than 75 mm (3 in.) for operating speed(s) in the down direction up to 0.50 m/s (100 ft/min)
(b) increased from 75 mm (3 in.) to 150 mm (6 in.) in proportion to the increase in operating speed(s) in the down direction from 0.50 m/s (100 ft/min) to 1 m/s (200 ft/min)
(c) aminimum 150 mm (6 in.) for operating speed(s) in the down direction exceeding 1 m/s (200 ft/min)
3.4.2.2 Car Top Minimum Runby
The top runby of the car shall be
(a) not less than 75 mm (3 in.) for rated speeds up to 0.50 m/s (100 ft/min)
(b) increased from 75 mm (3 in.) to 150 mm (6 in.) in proportion to the increase in rated speed from 0.50 m/s (100 ft/min) to 1 m/s (200 ft/min)
(c) a minimum 150 mm (6 in.) for rated speeds exceeding 1 m/s (200 ft/min)

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