I70 joins I76 (the Pennsylvania turnpike) in Breezewood, so traffic would be slowed at the toll-booths even if a proper intersection was built. I suspect that

I70 joins I76 (the Pennsylvania turnpike) in Breezewood, so traffic would be slowed at the toll-booths even if a proper intersection was built. I suspect that there was some political wrangling that resulted in the US30 transition though - the truck-stops, restaurants and tourist-traps are loving it!