1. A system comprising: a gated sensor attached to a vehicle and configured to receive near infrared (NIR) pulsed and/or continuous wave (CW) modulated illumination signals from a scene, and to detect one or more traffic-signs that are present in the scene, wherein at least some of the traffic-signs are time-variant traffic-signs which present time-variant visual indicators; and a controller configured to: synchronize the gated sensor with said received NIR pulsed and/or CW modulated signals to yield at least one image of the one or more traffic-signs that are present in the scene; monitor and analyze, in real time and with respect to the at least one image: relative metrics indicative of one or more spatial relations between the vehicle and the one or more detected traffic-signs; and temporal data associated with the time-variant visual indicators of the time-variant traffic-signs, and apply one or more decision functions to at least two of: the detected one or more traffic-signs, the monitored relative metrics, and the temporal data associated with the time-variant visual indicators, to invoke an action selected from a predefined set of actions.