At a Glance: 20 Years of Partnering with ARTBA on the Work Zone Safety Information Clearinghouse Celebrating 20 Years of the Work Zone Safety Information Clearinghouse See related story. *Source: American Road and Transportation Builders Association, Transportation Builder®, Vol. 23, No. 3, pp. 5, 16–22. This IssueTTI’s Tradition of TeamworkVolume 53, Number 4December 2017Issue Overview On this page: For More Information For more information: