One Third of Street Pavers have Health Problems:

The inspectorate of labor is carrying out a new inspection into the health of workers who pave the streets. In 2006 it found that on 60% of the locations the work is done in an unhealthy and dangerous way. The working conditions have contributed to one third of the street pavers having health problems in their back, knees, or shoulders. Additionally, the street pavers are sometimes exposed to carcinogenic materials.
www.trouw.nl/laatstenieuws/laatstenieuws/article987812.ece/Arbeidsinspectie_controleert_stratenmakers