A signal device for a pedestrian or bicycle crossing, the signal device comprising: a computer device; and a single radar sensor connected to the computer device and adapted to detect touch-less demand for green light by detecting an object being a hand of a pedestrian or bicyclist in a first detection range and to detect pedestrian or bicyclist kerbside presence by detecting an object being the pedestrian or bicyclist in a second detection range, the second detection range being at least partly further from the radar sensor than the first detection range, wherein a permanent or stationary object in the first or second detection ranges (46, 50) is not detected, wherein the first detection range has a proximal end in the interval of 1 to 5 cm distance from the radar sensor and a distal end in the interval of 6 to 20 cm distance from the radar sensor, and wherein the second detection range has a proximal end which is equal to the proximal end or the distal end or any point therebetween of the first detection range and has a distal end in the interval of 1.5 to 3 m distance from the radar sensor, wherein the radar sensor is adapted to detect touch-less demand for green light and pedestrian or bicyclist kerbside presence in substantially the same direction, wherein the radar sensor is aimed in a substantially horizontal direction substantially parallel to the kerb at the pedestrian or bicycle crossing, wherein the computer device is configured to cause the signal device to issue a demand for green light if the radar sensor detects an object in the first detection range, and to issue a demand cancellation if the radar sensor stops detecting any object in the second detection range, wherein the computer device is configured to cause the signal device to issue a demand for green light if the radar sensor detects the hand of the pedestrian or bicyclist in the first detection range for a first predetermined time, and wherein the computer device is configured to cause the signal device to issue the demand cancellation a second predetermined time after the radar sensor stops detecting any object in the second detection range. a computer device; and a single radar sensor connected to the computer device and adapted to detect touch-less demand for green light by detecting an object being a hand of a pedestrian or bicyclist in a first detection range and to detect pedestrian or bicyclist kerbside presence by detecting an object being the pedestrian or bicyclist in a second detection range, the second detection range being at least partly further from the radar sensor than the first detection range, wherein a permanent or stationary object in the first or second detection ranges (46, 50) is not detected, wherein the first detection range has a proximal end in the interval of 1 to 5 cm distance from the radar sensor and a distal end in the interval of 6 to 20 cm distance from the radar sensor, and wherein the second detection range has a proximal end which is equal to the proximal end or the distal end or any point therebetween of the first detection range and has a distal end in the interval of 1.5 to 3 m distance from the radar sensor, wherein the radar sensor is adapted to detect touch-less demand for green light and pedestrian or bicyclist kerbside presence in substantially the same direction, wherein the radar sensor is aimed in a substantially horizontal direction substantially parallel to the kerb at the pedestrian or bicycle crossing, wherein the computer device is configured to cause the signal device to issue a demand for green light if the radar sensor detects an object in the first detection range, and to issue a demand cancellation if the radar sensor stops detecting any object in the second detection range, wherein the computer device is configured to cause the signal device to issue a demand for green light if the radar sensor detects the hand of the pedestrian or bicyclist in the first detection range for a first predetermined time, and wherein the computer device is configured to cause the signal device to issue the demand cancellation a second predetermined time after the radar sensor stops detecting any object in the second detection range.