Straight batons of rubber have a softer impact. Some of the kinetic energy bends and compresses the rubber and bounces off when the object is struck. Rubber batons are not very effective when used on the subject's arms or legs, and can still cause injury if the head is struck. That is why most police departments have stopped issuing them. The Russian police standard-issue baton is rubber, except in places such as Siberia, where it can be cold enough that the rubber may become brittle and break if struck. The traffic baton is red to make it more visible as a signaling aid in directing traffic. In Russia traffic batons are striped in black and white for the same reason, and in Sweden they are white. Until the mid-1990s, British police officers carried traditional wooden truncheons of a sort that had changed little from Victorian times. Since the late 1990s, the collapsible baton is issued except for public order duties, where a fixed, acrylic baton is used. Side-handled batons were issued for a while, but fell out of favour.