In most rolling stock built since the 1980s, passenger communication handles (PassComms) have been installed. When a PassComm is activated, an alarm activates in the driver's cab. If the driver decides the train is not in a safe place (i.e. in a tunnel, or on an overbridge) he will override the alarm. For this he has around 3 seconds to press an override button, otherwise the brakes automatically apply. The driver can also speak to the person who pulled the handle via a speaker/microphone mounted alongside the handle. On modern trains this is particularly useful since due to accessibility regulations the passcomm must be much easier to use and more accessible, making accidental as well as deliberate activation much easier. On some modern trains the passcomm in the accessible toilet is mounted such that it is often confused with the door or flush control leading to accidental activation.