WAC 296-880-20005 Fall protection required at four feet or more
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(9) Vehicles and rolling stock.
The employer must ensure that employees exposed to fall hazards of four feet or more to the ground or lower level from vehicles or rolling stock on which employees must be located in order to perform their job duties are protected by fall arrest systems, fall restraint systems, or positioning device systems.
EXCEPTION:
Where suitable anchorages cannot be provided or when the use of fall protection creates a greater hazard, work may be performed on vehicles or rolling stock without a fall protection system.
Oregon Administrative Rules, Chapter 437, Division 2
(5) Fall Protection.
(a) Motor and Rolling Stock Vehicles.
(A) All employees must be protected from fall hazards when working on motor and rolling stock vehicle surfaces more than 10 feet above a lower level or at any height above dangerous equipment.
(B) The employer must ensure that fall protection systems are provided, installed, and used according to the criteria in 1910.140 in this subdivision. Note to 437-002-0134(5)(a): The duty to provide fall protection for employees on walking-working surfaces other than motor and rolling stock vehicles is covered by 1910.28 (Duty to have fall protection and falling object protection) within 2/D. The criteria and practices for fall protection systems for walking-working surfaces other than motor and rolling stock vehicles is covered by 1910.29 within 2/D.
Source: https://osha.oregon.gov/OSHARules/div2/div2I.pdf
PLEASE send me other states with fall protection requirements while working from motor vehicles and/or rolling stockings. So far, I have OR and WA.