The Nevada Department of Transportation has recently changed exit numbers on Interstate 580 from South Carson Street in Carson City to the Reno spaghetti bowl, per federal requirements.
Why the change?
The federal Manual on Uniform Traffic Control Devices ensures that freeway signs and mileposts are consistent nationwide to covey a clear message and help guide, warn and regulate traffic. Federal guidelines require interstate exit numbers to reflect mileage specific to that corridor. Previous I-580 exit numbers reflected U.S. 395 mileage beginning at the Nevada-California state line near Topaz Lake. Now that the I-580 connection from the Reno spaghetti bowl to south Carson City is complete and supersedes the previous U.S. 395 designation, exit numbers were changed to reflect interstate mileage beginning at the I-580 junction with south Carson Street and ending at the Reno spaghetti bowl.
Small exit number sign panels at the top of overhead signs were replaced, as well as roadside exit number signs at each exit.
The previous exit numbers ranged from 38 to 68B, and were replaced with new, lower exit numbers corresponding with roadway mileage, beginning at the southern end of the I-580 Carson City Freeway and progressing north to the Reno spaghetti bowl.