Considering the docker image is more than one Gigabyte, it is better to generate or download the docker image using WiFi or a very stable internet connection, and then copy the image to your car.
After generating or downloading a docker image, you can save the docker image into a local tar file.
e.g.
# docker save -o <save image to path> <image name>
docker save -o apollo_img.tar apolloauto/apollo:release-latest
After copying the .tar file to the car, you need to load the docker image from the .tar file as shown below:
# docker load -i <path to image tar file>
docker load -i apollo_img.tar