| CPC G08B 21/02 (2013.01) [G08B 13/00 (2013.01); G08G 1/01 (2013.01); G08G 1/164 (2013.01)] | 21 Claims |

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1. A system comprising:
a vehicle receiver/interface device which is connectable to a Controller Area Network (CAN) or Local Interconnect Network (LIN) of a service vehicle that has at least one of: a horn, siren, light, or public address system that can be actuated through said Controller Area Network (CAN) or Local Interconnect Network (LIN); and
at least one incursion sensing device positionable a spaced distance away from the service vehicle on or near an edge or boundary of a protected area;
wherein said at least one incursion sensing device comprises a sensor which senses an incursion event indicative of a vehicle crossing said edge or boundary of the protected area, and a transmitter which wirelessly transmits an incursion signal to the vehicle receiver/interface device when the incursion sensing device senses an incursion event; and
wherein the vehicle receiver/interface device comprises a receiver configured to receive said wireless incursion signal and circuitry configured to cause said at least one of: a horn, siren, light or public address system, to emit an incursion alarm in response to receipt of said incursion signal.
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