This bill amends existing law (RCW 46.61.608 and 2013 c 139 s 1) to change how motorcycles may occupy lanes and use the right shoulder on limited access roadways. It affirms that motorcycles are entitled to full use of a lane and prohibits other vehicles from depriving a motorcycle of full lane use, prohibits a motorcycle from overtaking and passing in the same lane or shoulder occupied by the vehicle being overtaken (except when passing a pedestrian or bicyclist at a safe passing distance of at least three feet), and prohibits operating a motorcycle between lanes of traffic or between adjacent lines or rows of vehicles. The bill limits motorcycles to no more than two abreast in a single lane and creates a conditional allowance for motorcycles to temporarily travel on the right shoulder of a limited access roadway when traffic is stopped or when the average speed in the travel lanes is 25 mph or less, subject to speed and usage restrictions (no more than 10 mph faster than adjacent lane traffic, single abreast on the shoulder, reenter traffic if the shoulder is occupied by specified roadside vehicles, and not continuing on the shoulder when reaching an exit that provides an alternative route or visible fuel/food services). The bill treats overtaking/passing and operating between lanes as not applying to police officers performing official duties. It identifies affected groups such as motorcyclists, other motor vehicle drivers, pedestrians and bicyclists, police officers, and roadside assistance or emergency vehicles. The text provided does not define key terms used in the section (for example, "motorcycle," "right shoulder," or "limited access roadway") and does not include an effective date, enforcement mechanisms, penalties, or other implementation details, so those aspects remain unclear from the extracted material. The bill is identified as House Bill 1367, H-0150.1 and was referred to the Committee on Transportation.

If enacted, the law would give motorcyclists clear permission to claim a full lane and adds a limited, conditional option to travel on the right shoulder when traffic is stopped or very slow, while tightening where and how they may pass and forbidding lane-splitting or riding between lanes. The people most affected are motorcycle riders, who would get an extra way to bypass stopped or slow traffic but would also face specific speed limits, single-abreast rules, and obligations to reenter lanes when the shoulder is blocked or when reaching exits with visible services; other drivers must avoid depriving motorcycles of full lane use and may see more motorcycles on shoulders or reentering traffic. The bill does not change funding or lay out enforcement details, and it leaves key terms (like what counts as a limited access roadway or the shoulder) undefined, so how agencies enforce the new shoulder rules and how courts or police apply exemptions for officers could vary and create uncertainty or added enforcement burdens.