At Colgan

ARRIVAL
Cat I: basically RVR 2400

DEPARTURE
Standard 1 mile for 2 engine aircraft; but can use lower (listed below)
1/4 mi or RVR 1600: must have RCLM, CL, HIRL, or some other visual cue
1200 RVR TDZ / 1000 RVR RO: must have CL
600/600/600: must have CL and RCLM