Honda WX15T Owner's Manual page 21

OPERATION
If the discharge hose must run across a roadway, the hose should
cross the roadway perpendicular to traffic flow. Also, heavy boards
should be placed next to the hose so the motor vehicle weight does not
shut off the discharge as vehicles cross over the hose.
BOARDS
DISCHARGE HOSE
Driving over a discharge hose while the pump is running, or even
possibly when the pump is stopped, may cause pump case failure.
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