Udo is reached by ferry from Seongsan Port or Jongdal Port in eastern Jeju; VisitJeju says the crossing usually takes 10–15 minutes depending on route. Its official detail states that external vehicle traffic restrictions on Udo run from August 1, 2026 through July 31, 2029. Conditional exemptions may include sixteen-seat charter buses, qualifying first-class low-emission hydrogen/electric rentals, cars used by eligible mobility-impaired travellers and renters staying overnight on Udo. Motorbikes and personal mobility devices have separate rules depending on vehicle type, speed and insurance. The listed Udo Marine Provincial Park admission is KRW 1,000 for adults, 800 for youth/military personnel and 500 for children; ferry tickets are a separate expense. Verify actual sailings, weather cancellations, last return departure and permission to bring your particular vehicle with its operator.