Answer
Tunnels are fast for standard sedans; self-serve lets you focus high-pressure wands on sandy bumpers and bike racks. SUVs with thick mud may need both—vacuum bays separate from wash lines. Read height and mirror fold warnings at tunnel entry.
Sources: Visit Ocean City
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
