Center line.

RCW 46.04.100
in effect
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"Center line" means the line, marked or unmarked, parallel to and equidistant from the sides of a two-way traffic roadway of a highway except where otherwise indicated by painted lines or markers. "Center line" means the line, marked or unmarked, parallel to and equidistant from the sides of a two-way traffic roadway of a highway except where otherwise indicated by painted lines or markers.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=46.04&full=trueFetched: 6/29/2026

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