SEATTLE — There are big changes in the way drivers get on and off State Route 99 in Seattle.

Entrances and exits are located to the north of the tunnel near the Space Needle and to the south near the stadiums. 

WATCH: WSDOT gives update as crews prep to open Seattle tunnel

Driving north on SR 99

Tunnel on-ramp: South Royal Brougham Way and Frontage Road in SODO

Tunnel off-ramp: Dexter Avenue North and Republican Street; turn left to get to Mercer Street and I-5 in South Lake Union

Be aware: The northbound SR 99 off-ramp to the stadium district is still under construction and won't be ready for about another week or two. If you want to get off SR 99 before the tunnel, you will need to do so at Spokane Street.

When the off-ramp to SODO does open, it will drop drivers at Alaskan Way and South Dearborn Street.

RELATED: Step-by-step: Driving northbound on SR 99 after tunnel opens

WATCH: Tutorial on driving north to and through Seattle via the tunnel:

WATCH: Tutorial on getting to northbound SR 99 from downtown with the tunnel:

Driving south on SR 99

Tunnel on-ramp: On Sixth Avenue North between Harrison and Mercer Streets in South Lake Union

Tunnel off-ramp: South Royal Brougham Way and Frontage Road in SODO

Be aware: There aren't any exits or entrances between South Lake Union and SODO. If you need to get off SR 99 before the stadium district, you can exit onto Harrison Street.

RELATED: Step-by-step: Driving southbound on SR 99 after tunnel opens

WATCH: Tutorial on driving south to and through Seattle via the tunnel:

WATCH: Tutorial on getting to SB SR 99 from Seattle with the tunnel:

Join KING 5's Seattle Tunnel Traffic Facebook group to stay up-to-date on the latest Seattle tunnel and viaduct news.