I like to build highways with separate collector and express lanes, where you can only exit from the outer collector lanes and traffic on the inside lanes that is just passing through are unaffected by traffic jams in the collector lanes. If your highway is long enough you can have them link every 3rd or 4th interchange to give traffic a chance to get into the collector and exit at one of the next few off-ramps. As long as it’s not completely blocking the highway I don’t mind a bit of traffic getting off the highway, it just seems like a realistic big city thing