Roads with a different speed limit in each direction?

[DriverDave]

Read something online recently about roads that have a different speed limit for each direction of the road. Not from construction or there being more/less lanes, but just a different limit for each side. What are some examples of this and what is the reasoning?

[cwf1701]

I-94 in Dearborn. 70 MPH WB/55 MPH EB the reason, the Ford Freeway was built to a 55 MPH standard starting in the late 40s, whereas the WB section is interstate standard for 70 MPH.

[1995hoo]

I don't know whether it's still the case, but in the summer of 1997, I-65 just north of the Alabama River near Montgomery had a 70-mph speed limit northbound and a 60-mph speed limit southbound for traffic approaching the city. I guess I could look at Street View, but I'm not motivated to do so.

I don't know whether this one counts: On I-95 in Virginia, the reversible HO/T center carriageway generally has a higher speed limit than the general-purpose lanes to either side of it (for the most part, it's posted at 65 mph while the general-purpose lanes are posted at 55 or 60, and there's a segment further south where the HO/T lanes are posted at 70 while the general-purpose lanes are posted at 65).

[I-55]

There are multiple instances of 55 mph zones on I-79 south of Washington, PA on only one side, the other side was still 70

[ElishaGOtis]

These examples are actively being reviewed for a change to get the discrepancy fixed.

SR-20 east of Hawthorne has a short section signed 45 EB (https://maps.app.goo.gl/LkPCGe2V6szrNFBd6) and 50 WB (first 50 sign: https://maps.app.goo.gl/jvLYHvYLHpDLagwP7 || where the EB 45 zone effectively ends: https://maps.app.goo.gl/ZigHmzPnZhp1ae6k7).

Much of SR-230 is signed as 60 WB and 55 EB, though it technically is only 55 in Bradford county. EB 55 sign: https://maps.app.goo.gl/ahPV8oBY2QZWJDWW7 || EB 60 sign: https://maps.app.goo.gl/86uKvvTkCuUAVMZAA || WB 60 sign: https://maps.app.goo.gl/K24MCWyzVnCbqos46