It is unlawful for any person to drive or move or for the owner to cause or knowingly permit to be driven or moved on any highway any vehicle or combination of vehicles which is in such unsafe condition as to endanger any person, or which does not contain those parts or is not at all times equipped with such lamps and other equipment in proper condition and adjustment as required in this chapter, or which is equipped with one or more unsafe tires or which is equipped in any manner in violation of this chapter or Iowa Code chapter 321. (2008 Code § 17-381)