What are the exact inbound driving routes and specific highway exit lanes to enter the SeaTac Rental Car Facility using State Route 518 West, Air Cargo Road, or SR 99 South?

To successfully enter the SeaTac Rental Car Facility (located at 3140 S 170th St, SeaTac, WA 98188) without missing the designated return ramps, drivers must follow precise lane assignments based on their inbound route. From State Route 518 West, take exit 1A (Air Cargo Road/SR 99 South). Immediately after exiting, stay in the far-left lane; this lane feeds directly into the left-hand return ramp, which leads to the facility's upper-level drop-off area. Do not merge right, as that lane continues onto Air Cargo Road. From Air Cargo Road (northbound), approach the intersection with S 170th St and keep to the right lane. This lane becomes the right-hand return ramp, providing access to the lower-level rental car pickup and return area. From SR 99 South (southbound), stay in the left lane as you approach the traffic signal at S 170th St. At the signal, use the dedicated left-turn lane (marked with a green arrow during peak hours) to enter the facility directly. The entire process from highway exit to facility entry typically takes under 2 minutes (approximately 0. Note that the left-hand ramp is for rental car returns only, while the right-hand ramp serves both returns and pickups. Missing the correct lane can result in a 5–10 minute detour via S 188th St. Always reduce speed to 25 mph upon entering the ramps.