A lighting and sensor system (10, 12) for marking carriageways and/or tunnel walls and/or for obtaining sensor information relating to conditions at carriageways and/or tunnel walls, comprising - an electrical feeder, - a plurality of inductive lighting and/or sensor devices (100; 100A, 100B), wherein each of the plurality of inductive lighting and/or sensor devices (100; 100A, 100B) has a local coupler (110; 111, 112) adapted to be coupled to the electrical feeder, a transceiver (120; 120') and a light source and/or a sensor (140, 140'), - a modem connected to the electrical feeder, and - a control unit coupled to the modem, wherein the control unit is configured to transmit control signals (61, 115) via the electrical feeder to the transceiver (120; 120') of each inductive lighting and/or sensor device (100; 100A, 100B) via the local coupler (110; 111, 112) of the respective inductive lighting and/or sensor device (100; 100A, 100B), wherein the transceiver (120; 120') is configured to transmit control signals (61, 115) to the control unit, characterized in that the lighting and sensor system (10, 12) further comprises an AC power source configured to provide an AC-voltage having a first frequency, wherein the modem is configured to modulate and de-modulate said control signals at a second frequency being different from the first frequency, wherein a matching network and a termination network are respectively provided at a beginning and at an end of the electrical feeder with a predetermined impedance, and wherein each inductive lighting and/or sensor device (100; 100A, 100B) further comprises a variable AC resonant circuit (131, 132) connected to an AC-power connection of the local coupler (110, 111, 112), wherein the variable AC resonant circuit (131, 132) is configured to adjust AC line currents of varying levels to a continuous power level. - an electrical feeder, - a plurality of inductive lighting and/or sensor devices (100; 100A, 100B), wherein each of the plurality of inductive lighting and/or sensor devices (100; 100A, 100B) has a local coupler (110; 111, 112) adapted to be coupled to the electrical feeder, a transceiver (120; 120') and a light source and/or a sensor (140, 140'), - a modem connected to the electrical feeder, and - a control unit coupled to the modem, wherein the control unit is configured to transmit control signals (61, 115) via the electrical feeder to the transceiver (120; 120') of each inductive lighting and/or sensor device (100; 100A, 100B) via the local coupler (110; 111, 112) of the respective inductive lighting and/or sensor device (100; 100A, 100B), wherein the transceiver (120; 120') is configured to transmit control signals (61, 115) to the control unit, characterized in that the lighting and sensor system (10, 12) further comprises an AC power source configured to provide an AC-voltage having a first frequency, wherein the modem is configured to modulate and de-modulate said control signals at a second frequency being different from the first frequency, wherein a matching network and a termination network are respectively provided at a beginning and at an end of the electrical feeder with a predetermined impedance, and wherein each inductive lighting and/or sensor device (100; 100A, 100B) further comprises a variable AC resonant circuit (131, 132) connected to an AC-power connection of the local coupler (110, 111, 112), wherein the variable AC resonant circuit (131, 132) is configured to adjust AC line currents of varying levels to a continuous power level. sensor device (100; 100A, 100B) via the local coupler (110; 111, 112) of the respective inductive lighting and/or sensor device (100; 100A, 100B), wherein the transceiver (120; 120') is configured to transmit control signals (61, 115) to the control unit, characterized in that the lighting and sensor system (10, 12) further comprises an AC power source configured to provide an AC-voltage having a first frequency, wherein the modem is configured to modulate and de-modulate said control signals at a second frequency being different from the first frequency, wherein a matching network and a termination network are respectively provided at a beginning and at an end of the electrical feeder with a predetermined impedance, and wherein each inductive lighting and/or sensor device (100; 100A, 100B) further comprises a variable AC resonant circuit (131, 132) connected to an AC-power connection of the local coupler (110, 111, 112), wherein the variable AC resonant circuit (131, 132) is configured to adjust AC line currents of varying levels to a continuous power level.