UNDER AGE 16, MUST WEAR HELMET

For proof, check out DC Code § 500-1605

AGE 16 OR OLDER, NO HELMET NEEDED

In Virginia

NO STATEWIDE HELMET REQUIREMENT

For proof, look at Virginia Code § 46.2-906.1

BUT BY ORDINANCE IN ARLINGTON, FAIRFAX, and ALEXANDRIA

UNDER AGE 15, MUST WEAR HELMET

Don’t take my word for it, see Arlington Code § 14.2-64.1. For Fairfaxians, see Fairfax Code § 82-6-38.1. For Alexandrians, take note of Alexandria Code § 10-7-12

AGE 15 OR OLDER, NO HELMET NEEDED

In Maryland

UNDER AGE 16, MUST WEAR HELMET

AGE 16 OR OLDER, NO HELMET NEEDED

For the source, look for Maryland Transportation Code § 21-1207.1