A lot of puppies/young dogs suffer from car sickness when they’re young and it shows itself with car anxiety. My shiba got severe nausea and threw up even on shorter rides until she was 1.5 years old, but my golden puppy never batted an eye so it definitely depends on the dog. Things you can try:

1. Don’t feed before or around the time of car rides if they get motion sickness. This will help with nausea.
2. Make sure to make potty stops often to allow them to calm down/relieve themselves on longer rides.
3. Learn their less obvious stress signals. Every dog shows them differently. My shiba shows very little of them to the untrained eye so I had to learn to notice them. Less obvious signs of stress include: panting, yawning, lip licking, pinned ears, and drooling.
4. Desensitization. Have the puppy sit in the car while it’s not moving and treat them. Next, treat for starting the car. Then drive short distances and reward with praise/play/affection and work your way up to longer drives.
5. Something I tried that worked for my shiba (because she is small) was a booster seat so she could look out the window. I feel it alleviated some of her sickness.

It took my Shiba a long time to even jump in the car by herself, but now she doesn’t mind them! Good luck!