Samenvatting
This synthesis identifies available information and research gaps relating to the use of chemical substances by commercial drivers and is intended to provide up-to-date information to inform decision makers about the near-, mid-, and long-range planning needs for research and educational outreach programs. The report is designed to help the commercial transportation safety community and the Federal Motor Carrier Safety Administration in addressing issues involving the proliferation and availability of psychoactive chemical substances.Appendixes D and G to CTBSSP Synthesis 19 are available only in the pdf version of report at http://onlinepubs.trb.org/onlinepubs/ctbssp/ctbssp_syn_19.pdf. (Author/publisher)