California Code, Vehicle Code - VEH § 15312

(a) Not less than 60 days if that person is convicted of a violation of subdivision (a) of Section 2800, or Section 21462, 22451, or 22452, or subdivision (c)or (d) of Section 22526, involving a commercial motor vehicle and the violation occurred at a railroad-highway crossing.

(b) Not less than 120 days if that person is convicted of a violation of subdivision (a) of Section 2800, or Section 21462, 22451, or 22452, or subdivision (c)or (d) of Section 22526, involving a commercial motor vehicle, and that violation occurred at a railroad-highway crossing, during any three-year period of a separate, prior offense of a railroad-highway grade crossing violation, that resulted in a conviction.

(c) Not less than one year if that person is convicted of a violation of subdivision (a) of Section 2800, or Section 21462, 22451, or 22452, or subdivision (c)or (d) of Section 22526, involving a commercial motor vehicle, and that violation occurred at a railroad-highway crossing, at a railroad-highway grade crossing, during any three-year period of two or more prior offenses of a railroad-highway grade crossing violation, that resulted in convictions.