R91-4 (CA) NO TRUCKS AXLES OR MORE NO VEHICLES WITH, 50% OFF
File:MUTCD R9-11a.svg - Wikimedia Commons
Comparison of Gondwanan road signs - TEPwiki
File:MUTCD R9-8.svg - Wikimedia Commons
File:MUTCD R9-6.svg - Wikipedia
R91-4 (CA) NO TRUCKS AXLES OR MORE NO VEHICLES WITH, 50% OFF
Category:SVG regulatory road signs of the United States
File:MUTCD R9-5.svg - Wikimedia Commons
File:MUTCD W3-1 (non-compliant 4).svg - Wikimedia Commons