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This is a question that is easy to answer. NO there is no built-in algorithm specifically designed for detecting roads. HOWEVER, there is OpenCV functionality that could get you to the point you want to.

For detecting roads there are different approaches possible, first you should read papers concerning this topic, for getting an idea of the algorithms around.

Basically these steps could be followed - Perform edge detections on image - Try to apply a linear Hough transform in order to find lines in the image - Then define how far lines should be apart (a fact that is known, since aerial images are taken from a constant height). - Use the knowledge to remove unwanted lines that are not close enough and could not be grouped.

This is just an idea sprung from my mind. Saw some presentations about this at the last VISAPP conference in Barcelona. This is still a hot research topic in computer vision.

OpenCV provides functionality for edge detection and hough transforms. Go through the docs for that.

Cheers