AMTRAK 110 MPH MICHIGAN SERVICE GIVEN GREEN LIGHT

[PRR 60]

IIRC, between 110 MPH & 125 MPH is the only time that quad gates or other methods of preventing people from driving around are required. Over 125 MPH you aren't allowed any grade crossings.

Between 111 and 125 mph, "impenetrable barrier" devices are required. These are devices that can stop a moving vehicle that attempts to penetrate the barrier. Quad gates do not meet that standard.

For 110 mph and below, the FRA cedes requirements to the state regulatory agencies to be considered on a case-by-case basis. Over 125mph, no crossings are permitted.