I know the costs are higher but wouldn't a three level bridge resolve this in highly traveled area? Traffic flowing in one direction would be above traffic flowing in the other direction with the Interstate Highway at Ground Level. See Interstate 95 and the SR-84 exit in Fort Lauderdale, FL as an example. Eastbound traffic flows on the upper bridge with no turn signal onto I-95 North, however traffic exiting from I-95 South has a stop light as the left lanes are segregated from the flow through lanes on the right and share the lanes of the people entering the interstate going north. The same thing happens with the westbound traffic on a lower bridge. This allows through traffic to continue over the bridges without stopping.

https://www.google.co.uk/maps/place/...!3m1!1s0x0:0x0