This black and yellow sign is posted in front of the side rails on narrow bridges, or in front of any solid object that a driver needs to avoid. Examples of these other obstacles include telephone poles, medians, guard rails as this picture shows, trees near the road, and sharp drop offs near the road. I consider the information this sign gives to be one of the most important signs a driver should look for and follow. Why? Because this sign is posted in front of obstacles that are highly dangerous to the driver. For example, this sign should be placed in front of a telephone pole near the road. Now, imagine making the mistake of hitting that telephone pole. You are going to lose severely. Your car will probably be totaled and the telephone pole will be fine. A mistake in relationship to honoring and following this sign could be your last. Seriously, this sign plays a great role in helping drivers around highly dangerous situations.