What signifies the start of a divided highway?

The start of a divided highway is indicated by a sign that features one upward-pointing arrow and one downward-pointing arrow, often with a curved shape at the top. This symbol clearly signifies that the road ahead is divided, with separate lanes for traffic moving in opposite directions. It is essential for drivers to recognize this sign as it alerts them that they will be entering a roadway designed to separate opposing traffic, which enhances safety by reducing the likelihood of head-on collisions.

The other choices do not accurately represent the start of a divided highway. The second option, which features two arrows pointing sideways, does not provide specific information about lane divisions or traffic direction. The third option, a diamond sign with lane markings, typically indicates warning signs rather than the beginning of a divided highway. Finally, a rectangular sign with distance indicators is generally used for informational purposes regarding distance to destinations, further not related to the specific traffic pattern of divided highways.