Isn't part of I-49 in Louisiana posted at 75 MPH?
I-49 in Louisiana is posted at 75 mph for around 230 miles between the Arkansas border and Opelousas, about 20 miles north of Lafayette, excluding Shreveport and Alexandria. Before Arkansas just recently raised its speed limits to 75 mph, the speed limit abruptly dropped at the border with no reduction warning, simply "Speed Limit 70" signs coming into Arkansas.
I can think of multiple instances of state line speed limit drops with no advance warning
- US-30 drops from 70 to 60 entering Indiana from Ohio
- US-82 drops from 70 to 65 entering Mississippi from Alabama
- I-75 drops form 70 to 65 entering Tennessee from Kentucky. I remember when it was still 70 there, threw me off the first time I drove it after the change, but I completely agree with the premises for lowering the limit there.
- US-35 used to drop from 70 to 65 crossing the Silver Memorial Bridge into West Virginia, but after 3 or so years Ohio lowered the speed limit on the bridge approach (probably for sharp curves at the OH-735 interchange). I personally think Ohio never meant for that approach to be 70 but it became 70 when the speed limits were increased in 2013(?) and the sign that set the speed limit for 65 at the time was after the on ramp from OH-160 at the first Gallipolis exit, so when that sign got changed there were no signs between there and the river.
I imagine there will be no warning for I-55 going from 75 to 70 entering Missouri north of Blytheville.
100th post had to put a little extra effort into this one