The word "vehicular" is a modern English formation built directly upon the Latin root. It originates from Latin vehiculum, meaning "a means of transport," which itself derives from vehere, "to carry or convey." The suffix -ular is a compound adjectival ending common in scientific and formal English, formed from -ul- (a variant of -ule, indicating a small or instrumental noun) and -ar. Thus, the literal construction "pertaining to a means of conveyance" evolved into the specialized modern adjective used primarily in legal and technical contexts to describe anything related to road vehicles, such as traffic, accidents, or design standards.

Structure: vehic (vehicle) + ul (adjective suffix) + ar (adjective suffix) - vehic: From Latin vehiculum (a means of transport, a conveyance). The functional role is the core root meaning "vehicle". - ul: A Latin adjectival suffix, often found in words borrowed from Latin (e.g., miraculous, oracular). Its role is to form adjectives from noun stems. - ar: A Latin-derived adjective-forming suffix (e.g., molecular, spectacular). Its role is to further specify the adjectival form.