Meanings of 150a in English

I cross 150A and turn right down the interstate access ramp at the KWIK'N'EZ without looking back.

Less than a mile later, where I must cross 150A, I have to wait a minute for several trucks heading toward Peoria to rumble past.

He crossed Jubilee College Road, took the narrow cutoff road through frozen fields to 150A, kept going straight, and turned east onto an empty I-74.