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Passive Warning Devices

Safety at Indiana rail-highway crossings are controlled through a variety of roadway signs, warnings, and pavement notices.   

RR Advance Warning Sign  
The advance warning sign is placed to attract the driver’s attention and warn that there is a railroad crossing ahead so the driver can slow down to look and listen for a train. It's the driver's responsibility to be in control of the vehicle and stop if required. Installation of advance warning signs are the responsibility of the public agency that owns the roadway at the crossing.
Pavement Markings  
Pavement markings include the white RXR symbol on the roadway, usually near the advance warning sign, to warn that a crossing is ahead. A white stop bar is painted near the crossing itself. Installation and maintenance of pavement markings are the responsibility of the public agency that owns the roadway at the crossing.
Railroad Crossbuck Sign  
The “Crossbuck” is a regulatory sign required by state law at all public crossings. The driver must treat the crossbuck as a yield sign. Crossbuck installation and maintenance is the responsibility of the railroad.
Stop Sign  
A stop sign may also be placed at a railroad crossing. Placement of stop signs are the responsibility of the public agency that owns the roadway at the crossing. Where a stop sign is in place at a crossing, motorists must stop every time that they approach the crossing, even when a train is not in sight.


Street lights are another type of passive device that may help improve safety at rail crossings where there is concern about motorists being able to see trains at the crossing during nighttime hours. Determining if streetlights are needed at a crossing (and the cost to install and to maintain and operate the lights) is the responsibility of the agency that owns the roadway.

INDOT does have a program that can assist with funding passive warning improvements. These funds are administered by the INDOT Railroad Section.

Flashing Lights plus Gates

Train activated warning devices include flashing lights and gates. Some crossings may be protected with flashing lights and no gates. Others may have both the flashing lights plus gates that drop across the roadway in front of approaching traffic. Motorists must stop whenever automatic signals are activated.

These automatic warning devices are expensive and are primarily used at crossings where there is a high risk of collisions between motor vehicles and trains due to the amount of roadway and/or train traffic, the crash history, and other factors.

It costs about $250,000 to equip one crossing with flashing lights and gates. The time required for the installation may take 18 months from project initiation to construction. The actual construction of active warning devices is the responsibility of the railroad. Once active warning devices are installed, the railroad is responsible for maintenance costs.
The owner of the public roadway at the crossing generally has the responsibility for deciding which crossings should have lights and/or gates and for the cost to install them. However, if a railroad creates a new crossing by extending a track across a roadway, the railroad is responsible for the cost to install the warning devices. Railroads and other entities may sometimes voluntarily help pay the cost to install lights and gates at other crossings, but in general there are no laws that require them to do so. However, INDOT does have the regulatory authority to order installation of lights and/or gates at any public crossing that INDOT has determined to be an extraordinary hazard, and to divide the costs among the various parties as appropriate.

How do Signals Work?

Equipment improvements continue to be made which means installations will vary in the way signals are activated. But all signals work on the principle of being activated when an approaching train reaches a certain distance from the crossing.

Train activated signals are operated from a signal control cabinet. When a train is detected, the controller determines when to activate the lights so that there is at least 20 seconds of warning before the train arrives. The controller sends a signal to the relays, which in turn send power to activate the flashing lights.

Note that a signal always operates from battery power, not the AC power line. AC power is used only to keep the batteries charged. In the event of an AC power failure, the signals will operate on batteries anywhere from several hours to several days, depending on the weather, the number of trains and other factors. However, if the batteries are run to depletion crossing gates will lower automatically due to gravity but the lights will no longer flash. Never go around a lowered railroad-crossing arm unless directed to do so by a police officer or railroad crew.

Constant warning time devices are used at crossings where there can be both fast and slow train speeds. The devices detect an approaching train and then measure its speed and wait to activate the lights and gates until the train is about 25 seconds away from the crossings. This avoids a problem with DC circuits in which a slow moving train may activate the lights and/or gates several minutes before the train reaches the crossing resulting in frustrating delays to motorists. 

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