1. A method comprising: receiving, at a computing device configured to control a vehicle, from an image-capture device coupled to the vehicle, an image of a vicinity of a road on which the vehicle is travelling; selecting, from the image, using the computing device, an image portion corresponding to a side of the road at a predetermined height; detecting, using the computing device, a construction zone sign in the image portion; determining, using the computing device, a type of the construction zone sign; detecting one or more construction zone objects on the road; determining, based on a number and locations of the one or more construction zone objects, a severity of road changes; and controlling, using the computing device, the vehicle based on (i) the type of the construction zone sign, and (ii) the severity of road changes.