Railroad and Special-Purpose Signs: Crossbucks, Buses, and Emergency Vehicles
What this domain tests
Rail crossings, school buses, and emergency vehicles produce some of the highest-consequence decisions on the Kentucky test. Kentucky has many rural passive crossings with no lights or gates, so the exam expects you to know what a crossbuck alone does and does not do.
Railroad crossings
- Passive crossing - a white crossbuck marked RAILROAD CROSSING is the only device. It means yield to trains; it does not guarantee a warning will sound. A "2 TRACKS" plaque means a second train may follow the first.
- Active crossing - flashing red lights and gates. Stop when the lights begin flashing, and never drive around a lowered gate. The gate is a barrier, not a suggestion.
- Advance warning (W10-1) - a round yellow sign with a black X and "RR," posted well before the crossing, reinforced by a white X and "RR" painted on the pavement.
- Trains cannot stop quickly: a freight train traveling 55 mph needs more than a mile to halt.
School buses and emergency vehicles
Kentucky requires you to stop for a school bus displaying flashing red lights on an undivided road, in both directions. On a four-lane divided highway, traffic approaching from the opposite direction need not stop; traffic behind the bus always stops. Under Kentucky's Move Over law, when you approach a stopped emergency vehicle, tow truck, or any vehicle with flashing lights, change lanes away from it or slow substantially.
Worked example
You approach a crossbuck with flashing red lights and a descending gate. You stop, even though the gate has not yet blocked your lane, and you wait until the lights stop and the gate rises fully. Passing around a lowered gate is both illegal and frequently fatal.
Traps that cost marks
Assuming a crossbuck guarantees lights; passing a stopped school bus on a two-lane road because the opposite lane looks clear; and treating a divided-highway school bus rule as applying to traffic behind the bus.