Shortest interstate merges

[jmacswimmer]

In Frederick MD, the westbound onramp to I-70 at exit 55 used to be pretty nasty.  This ramp is much busier than the other 3 ramps at exit 55 due to the nearby exit 56 missing a westbound onramp (well, there is one, but for official access only).

It was pretty common during busy periods for vehicles to have to stop at the end of the ramp, wait for a gap, then gun it like there's no tomorrow.  Thankfully this situation is no more - as part of the bridge replacement carrying 70 over South Street and a CSX rail line, the mainline was widened from 2 to 3 lanes and the onramp continues as an auxiliary lane to exit 54.

Bay Bridge ramp is a carryover of US-40 and US-50.

I imagine a lot of the examples in this thread are a result of the I-designation being added later - for instance, my example above is because that stretch of freeway was originally the US 40 Frederick Bypass, which later became a part of I-70 (and then gradually updated to modern standards throughout the 2000's-2010's).  Same goes for pretty much all the PA examples.