Bypasses of bypasses

[pderocco]

Hard to believe nobody's mentioned this yet- I-495 is a bypass to 128 which is a bypass to I-93/former US 1.

I dunno, I don't think anyone drives I-495 to bypass MA-128 (now I-95), because it's much, much longer, the second longest 3di in the country. It's more along the lines of Houston's three concentric beltways (and was originally supposed to be three, including the Inner Belt).

[LilianaUwU]

Toronto? ON 2 was the original way, then ON 401 became the most used highway in North America, then ON 407 was built as a bypass of 401.

[freebrickproductions]

Maybe not quite a triple bypass per say, but I found this in Kentucky recently on Google Maps and thought it was kinda neat:
https://www.google.com/maps/@38.2846272,-84.1581965,3510m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MTAyOC4wIKXMDSoASAFQAw%3D%3D

It appears there that US 68 originally crossed the former L&N line twice there, but, at some point, it got realigned to take the two railroad crossings off of the highway and straighten it out a little. Then, later, when the highway was widened to four lanes there the second alignment was partially subsumed but otherwise bypassed entirely by the four-lane road.