I would just say 4H can be used on the highway, so long as it is in slick conditions, at any speed appropriate for those conditions. I'm always shifting in and out of 4H on snow slick roads, 4A does this for you.2H - Power only to rear wheels - normal driving
4L- Power to all 4 wheels - low range for slow driving - Cannot be used at highway speeds
4H- Power to all 4 wheels - high range for more speed than 4L - Not recommended on highway
4A- Power to rear wheels and front ones as needed(decided by computer) Can be used at highway speeds.
Sponsored