Designates the "Mayor Mary Louise Carter Highway" in St. Louis County

HB 3424 designates a section of highway in St. Louis County, from I-270 east to CST Sutter Avenue, as the "Mayor Mary Louise Carter Highway." The Missouri Department of Transportation will install and maintain signs for this route, with costs covered by private donations rather than public funds. This bill directly affects the local community and travelers using this specific highway segment. It is a procedural naming measure with no substantive policy changes.