What does a sign displaying a deer symbol instruct drivers to do?

A sign displaying a deer symbol is designed to alert drivers to the presence of deer in the area, indicating that they should be vigilant and watch for deer crossing the road. This is particularly important in regions where deer are common, as they can unexpectedly enter roadways, especially during dawn and dusk when they are most active. By being aware of this warning, drivers can reduce the risk of collisions, which can lead to significant vehicle damage, injury, or even fatality.

The other options suggest actions that do not align with the primary purpose of the deer crossing sign, which is to promote caution rather than to increase speed, restrict road use, or advocate for particular visibility enhancements. Thus, being alert and prepared to stop or slow down when a deer is spotted is the most effective and safe response to such signage.