Abstract: A vehicle, provided with: at least an optical passage situated at a vehicle exterior for passing on optical signals; a number of elongate optical signal guides, extending between said passage and at least an optical signal processing unit situated in the vehicle, wherein the optical processing unit is provided with a transmitter for transmission of diverging optical signals; wherein an optical system is arranged to pass on light between the signal processing unit and proximal ends of at least a number of the optical signal guides, wherein the optical system comprises a collimator to collimate optical signals coming from the transmitter.

Abstract: Vehicle, provided with: —at least an optical passage (1) situated at a vehicle exterior for passing on optical signals (S1, S2); —at least an elongate optical signal guide (2), extending between said passage (1) and at least an optical signal processing unit (U) situated in the vehicle. The invention further provides a system for transmitting and receiving optical signals, as well as methods.

Abstract: An emergency service warning system, arranged to warn a user of approach of emergency services, provided with: at least one movable emergency service transmitter (T) and at least one stationary base station (M), which emergency service transmitter (T) and base station (M) are arranged to communicate utilizing uplink signals (S) and respective downlink signals (d); at least one user receiver (R) which is arranged to detect uplink signals (S) transmitted by the emergency service transmitter (T) and to deliver a warning signal upon detection of an uplink signal (S); wherein the user receiver (R) is arranged to search for uplink signals utilizing information concerning the at least one base station.

Abstract: An emergency service warning system, arranged to warn a user of approach of emergency services, provided with: at least one movable emergency service transmitter (T) and at least one stationary base station (M), which emergency service transmitter (T) and base station (M) are arranged to communicate utilizing uplink signals (S) and respective downlink signals (d); at least one user receiver (R) which is arranged to detect uplink signals (S) transmitted by the emergency service transmitter (T) and to deliver a warning signal upon detection of an uplink signal (S); wherein the user receiver (R) is arranged to search for uplink signals utilizing information concerning the at least one base station.