The bill amends RCW 46.61.655 to require that vehicles driven or moved on public highways be constructed or loaded to prevent any load from dropping, sifting, leaking, or otherwise escaping, and that loads and any required coverings be securely fastened. It requires that dirt, sand, or gravel carried on paved public highways be covered to prevent spillage unless six inches of freeboard is maintained, and imposes immediate cleanup and cost‑payment obligations on a person whose vehicle drops or escapes glass or other objects that would obstruct or endanger travel. Vehicles with mud, rocks, or other debris on body parts, undercarriage, wheels, or tires must be cleaned before operation on a paved public highway; vehicles being towed on a trailer must be cleaned before towing or be covered while being towed. The section exempts public maintenance vehicles when dropping sand to enhance traction and allows sprinkling water or other substances to clean or maintain a highway. The Washington State Patrol is authorized to adopt rules to implement the section. The amendment creates three levels of offense for failing to secure a load: a first‑degree offense where criminal negligence in failing to secure a load under the listed subsections causes substantial bodily harm, classified as a gross misdemeanor; a second‑degree offense where criminal negligence in failing to secure a load under the listed subsections causes damage to another’s property, classified as a misdemeanor; and an infraction for failures that do not meet the elements of the first or second degree. The text classifies the offenses but does not specify fines, sentence ranges, or statutory cross‑references for penalties. The extracted text does not include definitions for terms such as "public highway," "load," "covering," "freeboard," "criminal negligence," "substantial bodily harm," or "damage to property," does not provide an effective date, and does not show how the amendment differs from the prior version of RCW 46.61.655. Affected parties identified in the text include drivers and operators of vehicles on public highways, operators of towed vehicles, public maintenance vehicle operators, and the Washington State Patrol.

If enacted, drivers and vehicle owners using public highways will need to keep loads secured so nothing can fall, leak, sift, or escape, and must cover loads of dirt, sand, or gravel on paved roads unless they maintain six inches of freeboard. Anyone whose vehicle drops glass or other hazardous material must clean it up immediately and pay cleanup costs, and vehicles with mud, rocks, or debris must be cleaned before being driven on paved roads or before being towed (or be covered while towed). Public maintenance vehicles can still drop sand for traction, and the Washington State Patrol can write rules that further define how the law is applied. For people who haul materials this will likely mean more time and expense for tarping, cleaning, and compliance, and a higher risk of legal consequences if a load becomes loose: criminal negligence that causes substantial bodily harm would be a gross misdemeanor, property damage from negligence would be a misdemeanor, and other failures would be infractions. Important details are missing from the text provided—key terms, exact penalties, and an effective date are not included—so how strictly and in what form these requirements and penalties will be enforced depends on additional statutes, case law, and forthcoming rules from the state patrol.