Highway 99 and Interstate 5

 https://en.wikipedia.org/wiki/British_Columbia_Highway_99 Of course the BC part of the 99 has to be difficult, congested and constipated.

https://en.wikipedia.org/wiki/Interstate_5_in_Washington 

https://en.wikipedia.org/wiki/Interstate_5_in_Oregon 

https://en.wikipedia.org/wiki/Interstate_5#History

https://en.wikipedia.org/wiki/U.S._Route_99 

https://en.wikipedia.org/wiki/U.S._Route_99#Washington 

https://en.wikipedia.org/wiki/Oregon_Route_99E 

https://en.wikipedia.org/wiki/U.S._Route_99_in_California  

https://en.wikipedia.org/wiki/Interstate_5