![This traffic sign warns that there is a curve to the right ahead. It may be necessary for drivers to reduce their speed significantly, especially when they can’t see how sharp the curve is. Curves which come after a long straight section, or which are very different from other curves on the road, are particularly dangerous. Warning for a curve to the right.](/img/north-america/us/signs/warning/warning-curve-right.png)
Warning for a curve to the right.
![This traffic sign warns that there is a double curve ahead, first to the right and then to the left. It may be necessary for drivers to reduce their speed significantly, especially when they can’t see how sharp the curves are. This traffic sign is only used where the first curve is right behind the second. Warning for a double curve, first right then left.](/img/north-america/us/signs/warning/warning-curve-right-left.png)
Warning for a double curve, first right then left.
![This traffic sign warns for a sharp curve to the right. Warning for a sharp curve to the right.](/img/north-america/us/signs/warning/warning-curve-right-sharp.png)
Warning for a sharp curve to the right.
![This traffic sign warns for curves. Warning for curves.](/img/north-america/us/signs/warning/warning-curves.png)
Warning for curves.
![This traffic sign warns for a road narrowing, the width of the road ahead will suddenly become smaller. Warning for a road narrowing.](/img/north-america/us/signs/warning/warning-road-narrowing.png)
Warning for a road narrowing.
![This traffic sign warns for a road narrowing, the width of the road ahead will suddenly become smaller from the right. Warning for a road narrowing on the right.](/img/north-america/us/signs/warning/warning-road-narrowing-right.png)
Warning for a road narrowing on the right.
![This sign indicates the location of a railroad crossing and is placed close to the tracks. It is used at all railroad crossings whether or not they have barriers. Warning for a railroad crossing with 1 railway.](/img/north-america/us/signs/warning/warning-train-rail.png)
Warning for a railroad crossing with 1 railway.
![This sign indicates the location of a railroad crossing and is placed close to the tracks. It is used at all railroad crossings whether or not they have barriers. Warning for a railroad crossing with more than 1 railway.](/img/north-america/us/signs/warning/warning-train-rails.png)
Warning for a railroad crossing with more than 1 railway.
![This traffic sign warns for a road with two-way traffic. It is used where a one-way traffic changes into a two-way traffic. Warning for a road with two-way traffic.](/img/north-america/us/signs/warning/warning-two-way-traffic.png)
Warning for a road with two-way traffic.