A ground crew collision-avoidance system comprising: a plurality of radar sensor modules each located at a selected different location on an exterior of an aircraft that is at risk of collision with a ground object while the aircraft is being towed, wherein each radar sensor module comprises: a radar emitter configured to emit a radar signal; and a radar detector configured to receive a radar return signal associated with reflections of the emitted radar signal that are reflected from the ground object, wherein each radar sensor module communicates radar information corresponding to the respective detected radar return signal; a gateway unit communicatively coupled to the plurality of radar sensor modules and configured to receive the radar information communicated from the plurality of radar sensor modules; and at least one ground crew alert indicator communicatively coupled to the gateway unit, wherein the at least one ground crew alert indicator is arranged to be mounted on a front landing gear structure of the aircraft and comprises a display configured to present a graphical alert icon (226, 230, 234, 606, 608, 610, 612, 614, 616) that is visible to at least one member of the ground crew engaged in towing the aircraft, wherein information corresponding to a potential risk of collision of the aircraft with the ground object is communicated from the gateway unit to the at least one ground crew alert indicator, wherein the at least one ground crew alert indicator is configured to present the graphical alert icon on the display in response to receiving the information from the gateway unit; and wherein the at least one ground crew alert indicator is configured to present the graphical alert icon on the display at a presentation location that indicates a location of a potential collision of the aircraft with the ground object. a plurality of radar sensor modules each located at a selected different location on an exterior of an aircraft that is at risk of collision with a ground object while the aircraft is being towed, wherein each radar sensor module comprises: a radar emitter configured to emit a radar signal; and a radar detector configured to receive a radar return signal associated with reflections of the emitted radar signal that are reflected from the ground object, wherein each radar sensor module communicates radar information corresponding to the respective detected radar return signal; a radar emitter configured to emit a radar signal; and a radar detector configured to receive a radar return signal associated with reflections of the emitted radar signal that are reflected from the ground object, wherein each radar sensor module communicates radar information corresponding to the respective detected radar return signal; a gateway unit communicatively coupled to the plurality of radar sensor modules and configured to receive the radar information communicated from the plurality of radar sensor modules; and at least one ground crew alert indicator communicatively coupled to the gateway unit, wherein the at least one ground crew alert indicator is arranged to be mounted on a front landing gear structure of the aircraft and comprises a display configured to present a graphical alert icon (226, 230, 234, 606, 608, 610, 612, 614, 616) that is visible to at least one member of the ground crew engaged in towing the aircraft, wherein information corresponding to a potential risk of collision of the aircraft with the ground object is communicated from the gateway unit to the at least one ground crew alert indicator, wherein the at least one ground crew alert indicator is configured to present the graphical alert icon on the display in response to receiving the information from the gateway unit; and wherein the at least one ground crew alert indicator is configured to present the graphical alert icon on the display at a presentation location that indicates a location of a potential collision of the aircraft with the ground object.