Which sign color is associated with expressing recommendations for driver behavior?

The color white is typically used for regulatory signs, which convey rules that drivers must follow, such as speed limits and other important regulations. However, when it comes to expressing recommendations for driver behavior, white signs do not explicitly indicate recommendations.

While blue signs are associated with services and information that can assist drivers, such as rest areas or gas stations, they do not specifically recommend behaviors. Orange signs alert drivers to construction zones and hazards, indicating caution but not providing behavioral recommendations. Brown signs are used to indicate recreation and cultural interest areas.

In this context, a better choice would be green, which signifies guidance and indicates permitted movements or recommended paths. Therefore, while the initial answer suggests white, it is important to recognize that specific color coding is intended to convey regulatory, warning, information, or directional messages rather than recommendations.