Dump Truck Backing - Washington (DOSH)

A backup alarm tells people a truck is backing. It doesn't tell the driver whether anyone heard it. Federal rules let most vehicles with a blocked rear view back up with either an alarm or an observer. Washington keeps that rule for vehicles in general, then sets a tighter one for dump trucks: the alarm is required, and on top of it the driver must make sure the backing zone is clear, and if anyone is in it or could reasonably enter it, the truck backs only with an observer's signal or a camera that gives a full view behind. This Washington Dump Truck Backing Toolbox Talk covers that rule, who can serve as the observer, and the seat belt rule that goes with it.

Where the boundary of this talk sits#

This talk covers Washington's backing and seat belt rules for construction motor vehicles, with the focus on dump trucks. Hand signals, equipment blind spots, and general heavy equipment safety belong to their own talks.

The anchor#

Here is the distinction that carries this whole talk: in Washington a dump truck's backup alarm is required but never enough on its own — before backing, the driver must determine that no one is in the backing zone and that it is reasonable to expect no one will enter it, and if someone is or could be in it, the truck backs only when an observer signals it is safe or when an operable device such as a video camera gives the driver a full view behind — and the observer cannot be the flagger — so "the alarm was on" is not a defense when a dump truck backs over someone on a Washington site.

Vehicles in general: alarm or observer#

WAC 296-155-610 requires the employer to prohibit the use of any motor vehicle equipment with an obstructed view to the rear, other than passenger cars and pickups, unless it meets one of two conditions: it has an operable automatic reverse signal alarm audible above the surrounding noise level and audible no less than 15 feet (4.6 m) from the rear of the vehicle, or it is backed up when an observer signals that it is safe to do so.

That "or" matches the federal rule. For a service truck, a flatbed, or a water truck, one or the other is enough under this subsection.

Dump trucks: alarm, and then more#

The section has a separate subsection for operating dump trucks in reverse. It works in three steps.

Step 1: The alarm. The employer must make sure the dump truck has an operable automatic reverse signal alarm, audible above the surrounding noise level and audible no less than 15 feet from the rear. For dump trucks, the alarm is not an alternative to anything. It is always required.

Step 2: The driver checks the zone. Before backing a dump truck, the driver must determine that no one is currently in the backing zone and that it is reasonable to expect no employee will enter the backing zone while the truck is in reverse. The rule includes a diagram, labeled "Dump Truck Backing," that defines the backing zone behind the truck.

Step 3: If people are or could be there. If employees are in the backing zone, or it is reasonable to expect that an employee will enter it, the employer must make sure the truck is backed up only when:

• an observer signals that it is safe to back; or
• an operable mechanical device that provides the driver a full view behind the dump truck is used, such as a video camera.

On a busy site with laborers, grade checkers, and other trucks, Step 3 is the normal case, not the exception.

Who can be the observer, and what they do#

The rule says an observer can be any individual at the construction site, except a person performing the duties of a flagger. The flagger is busy controlling traffic and cannot also be watching the backing zone.

The observer must:

• be in the direct line of sight of the driver, or be able to communicate with the driver;
• be able to see the entire backing zone; and
• continue to provide direction to the driver until the driver reaches the destination and stops, or until there are no longer employees in the backing zone.

An observer who waves the truck back and then turns away to do something else has not met the rule.

Seat belts for everyone#

WAC 296-155-610 requires seat belts and anchorages meeting 49 CFR Part 571 to be installed in all motor vehicles and used by all occupants. The federal rule, 29 CFR 1926.601(b)(9), requires the belts to be installed. Washington adds that everyone in the vehicle wears one.

The rest of the vehicle rule#

WAC 296-155-610 also requires:

• a check of all vehicles in use at the beginning of each shift, to make sure listed parts, equipment, and accessories are in safe operating condition;
• service, emergency, and parking brake systems, maintained in operable condition;
• brake lights that always work, and headlights and taillights when visibility requires them;
• an audible horn at the operator's station;
• windshields with powered wipers, and rear-view mirrors on vehicles with cabs;
• fenders or mud flaps on rubber-tired equipment;
• on trucks with dump bodies, a permanently attached positive means of support that can be locked in position to prevent accidental lowering during maintenance or inspection;
• tailgate trip handles arranged so the operator is in the clear when dumping; and
• a cab shield or canopy to protect the operator from shifting or falling material when a haulage vehicle is loaded by cranes, shovels, loaders, or similar equipment.

Washington versus federal#

The federal rule, 29 CFR 1926.601(b)(4), allows any vehicle with an obstructed rear view to back with either a reverse signal alarm or an observer. Washington keeps that choice for vehicles in general, but for dump trucks it requires the alarm always, a clear-zone check by the driver, and an observer or full-view camera whenever someone is or could be in the backing zone. Washington also bars the flagger from serving as observer, sets what the observer must do, and requires seat belts to be used, not only installed.

Where the duty sits#

WAC 296-155-610 sets the general obstructed-view rule (alarm or observer), the dump truck backing rule (alarm, clear-zone check, observer or camera), who may be an observer and what they must do, seat belts installed and used, beginning-of-shift checks, and the equipment requirements. For contrast, federal 29 CFR 1926.601(b)(4) and (b)(9).

What can go wrong?#

• A driver backs a dump truck on the alarm alone while a grade checker works behind it.
• The flagger is also asked to spot the dump trucks.
• The observer signals once and walks away.
• The camera screen is broken, and the driver backs anyway.
• A passenger rides without a seat belt.

How do we manage this properly?#

• Alarm always — working, and audible 15 feet (4.6 m) behind the truck over site noise.
• Check the zone — no one in it, and no one expected to walk into it.
• People nearby? Observer or camera — every time.
• Observer rules — not the flagger, in line of sight, sees the whole zone, stays until the truck stops.
• Belts on — everyone in the vehicle.
• Stay out of the backing zone — if you must enter, make eye contact with the driver first.

Before you start#

Know where the trucks will back today, who the observer is, and whether the camera works. Stay out of the backing zone unless the driver and observer know you are there.

Talk it over#

• Who is our observer today, and are they free of other duties?
• Where is the backing zone for each dump truck stop?
• What do you do if a truck starts backing toward you?

The bottom line#

In Washington, any vehicle with a blocked rear view needs a working backup alarm or an observer. Dump trucks need the alarm every time, and the driver must check that the backing zone is clear. If anyone is in it or could enter it, the truck backs only on an observer's signal or with a camera that shows the full view behind. The observer is never the flagger, and stays with the driver until the truck stops. Everyone in the vehicle wears a seat belt.

Frequently asked questions about Washington dump truck backing rules#

Is a backup alarm enough for a dump truck in Washington?

No. Under WAC 296-155-610, the alarm is required, but the driver must also determine that no one is in the backing zone or likely to enter it. If someone is or could be in the zone, the truck may back only when an observer signals it is safe or when an operable device such as a video camera gives the driver a full view behind.

Download the Washington dump truck backing toolbox talk PDF#

Download this Washington Dump Truck Backing Toolbox Talk as a printable PDF in English and Spanish, and use it before the first haul of the day.

Related toolbox talks#

• Backing Up Vehicles and Spotters
• Blind Spots Around Heavy Equipment
• Struck-By Hazards
• Heavy Equipment Safety

Sources#

• Washington State Legislature, WAC 296-155-610 — Motor vehicles on construction sites (obstructed view to the rear, other than passenger cars and pickups: alarm audible no less than 15 ft or observer; dump trucks in reverse: alarm required, driver determines backing zone clear, observer or full-view device such as a video camera; observer any individual except a flagger, line of sight, sees entire zone, continues until stop; seat belts installed and used by all occupants; shift checks; brakes; dump body support; tailgate trip handles; cab shields; WSR 16-09-085, effective 5/20/16): https://app.leg.wa.gov/wac/default.aspx?cite=296-155-610
• OSHA, 29 CFR 1926.601(b)(4) (reverse signal alarm or observer) and (b)(9) (seat belts installed): https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.601

Written by FieldSafetyTalk's safety professional — a CSP, ASP, CHST and OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.

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