Around Liberty City in many places, they can be found, consisting of barriers around it and usually a hole in the ground where you can find workers and sometimes sparking electrical wires.
Unlike previous Grand Theft Auto games, where the sites are usually empty, in GTA IV, workers can be found on site. There are many objects and tools found in these areas, such as wheelbarrows and construction offices. Where the road works start during the day time there is a worker standing with a sign indicating the work. On the site, workers can be found, either using a hammer and hitting the ground, resting on an upright shovel, or just standing around and talking.