Portal:U.S. roads/Did you know/December 2018

...that although Interstate 8 does not cross the US-Mexico border it has multiple U.S. Border Patrol checkpoints, due to its proximity to the border near Yuma, Arizona and Jacumba, California?
... that Interstate 75 is the only freeway in the Upper Peninsula of Michigan?
... that sections of Washington State Route 821 are shut down for annual cattle drives, a marathon, and a heritage tractor run?
...that Pennsylvania Route 297 was renumbered from Pennsylvania Route 295 to avoid a number conflict when Interstate 295 was extended into Pennsylvania?
...that the section of Interstate 75 along Alligator Alley in Florida has a number of small bridges to allow wildlife to pass under the freeway?