(1) A diagnostic review will be conducted by a diagnostic review team at the site for each public at-grade railroad crossing considered for:

(a) proposed signals;

(b) upgrade of existing signals;

(c) proposed removal of signals;

(d) circuitry upgrade;

(e) road approach work;

(f) closure;

(g) other safety improvements deemed necessary by the diagnostic review team; and

(h) interconnection between railroad signals and traffic control signals.

(2) The road authority, railroad or MDT can request a diagnostic review be initiated to address specific or unusual needs at a public at-grade crossing.