These are all of the rides at Disneyland and California Adventure that have single rider lines. These lines are great for waiting for a much shorter time to get on the attraction. You will still have a wait, but it is usually significantly less than the normal standby queue. If you have a group of people, you can expect to be split up, but might still be in the same ride vehicle.
Space Mountain

Space Mountain is in Tomorrowland in Disneyland. It has a single rider line you can utilize to save time waiting in lines. To find the single rider line you’ll go towards the exit of the ride, just to the right of Alien Pizza Planet.
Matterhorn Bobsleds

Matterhorn Bobsleds is a roller coaster in Fantasyland in Disneyland. The single rider line is located near the exit of the ride by a stroller parking area.
Millennium Falcon: Smuggler’s Run

Millennium Falcon: Smuggler’s Run is one of the two attractions in Star Wars: Galaxy’s Edge. The other attraction, Rise of the Resistance, doesn’t have a single rider queue, but Smuggler’s Run does. To find it, go to the same area as the other lines. There are 3 altogether with single rider on the left, Lightning Lane in the middle, and standby on the right.
Radiator Springs Racers

Radiator Springs Racers is located in Cars Land in California Adventure. The ride vehicle holds 6 people and often you can be in the same car as people from your group, just on a different row of the car. The single rider line is located to the left of the Lightning Lane line and standby line.
Incredicoaster

Incredicoaster is a roller coaster on Pixar Pier in California Adventure park. This line is a little trickier to find. You’ll go partially up the boardwalk by the ride to find it. You can always ask Cast Members where to go if you need help. This is the fastest ride at Disneyland! See all of the fastest Disneyland rides here.
Soarin’

Soarin’ is a ride in California Adventure park that is always either Soarin’ Around the World or Soarin’ Over California. Ask a Cast Member at the entrance of the ride where to go for the single rider line. Sometimes there will be a Cast Member with a single rider sign showing you where to go.
Grizzly River Run

Grizzly River Run is another attraction in California Adventure that has a single rider line. You need to get a single rider pass from the Cast Member at the ride entrance and they will tell you where to go with it to board the ride.
WEB SLINGERS: A Spider-Man Adventure

WEB SLINGERS: A Spider-Man Adventure is an interactive ride in Avengers Campus in California Adventure. The single rider queue is right next to the standby entrance.
Goofy’s Sky School

Goofy’s Sky School is a wild mouse trap style roller coaster that is in California Adventure park. The single rider entrance is to the left of the standby entrance.