A blue sign can indicate what type of location?

Blue signs primarily serve as a wayfinding tool for travelers, indicating the location of services and amenities. In the context of transportation signage, blue signs are specifically used to denote services related to health and welfare, which includes hospitals.

While pedestrian crossings are indeed important locations, they are typically indicated by other colors such as yellow or fluorescent yellow-green to enhance visibility and safety for pedestrians.

Restaurants may also have blue signs indicating nearby services, but they usually do not use blue as a standard color for such markers; instead, they may be found in different sign colors depending on the branding or local signage regulations.

Therefore, the answer accurately reflects the primary function of blue signs by highlighting that they indicate health services like hospitals.