Utah Vehicle Safety Inspection Manual:
. Check bumpers to make sure that they meet OEM Specifications in verticalheight, and are centered on the vehicle's centerline. Bumpers must beconnected securely to the vehicle frame, and extend the entire width of thevehicle wheel track.a. REJECT when:1) Bumpers are not 4.5 inches in vertical height.2) Bumpers do not extend to the entire width of original bodywheel track.3) Bumpers are missing, improperly attached, broken, or haveportions protruding which create a hazard.4) Bumpers are not made from a matterial that is strong enoughto effectively transfer impact.
https://highwaypatrol.utah.gov/wp-content/uploads/sites/21/2015/03/2011-2012-SI-PLT-Manual.pdf