Yes, you do. Anti-Lock brake systems are designed to stop skids during rapid deceleration – that’s a fancy way of saying when you slam on the brakes, the car will stop quickly and safely without skidding too much. They do nothing to actually help with traction or steering control, however. In fact, on an icy or snowy road anti-lock will be pretty useless without snow chains, as the vehicle simply won’t have the traction to stop properly. Just bear in mind that, as this article from the LA Times points out, snow chains can affect the sensors that Anti-Lock brake systems rely on, making them less effective. All the more reason then, as we pointed out above, to drive sensibly and keep your speed down.