%0 Journal Article
%T Commentary on Cannabis and Crash Risk: Concentration Effect Relation
%J Transportation research circular
%D 2006
%A Ramaekers, Johannes Gerardus
%V 
%N E-C096
%P 65-66
%X These comments address the following: the role of tetrahydrocannabinol (THC) in driver impairment; contrasts between the results of epidemiological and experimental studies of THC; the role of higher doses and recent or past use of THC; threshold levels for THC; and the combined use of alcohol and THC.  Keywords: Cannabis impaired driving; Ethanol impaired driving <p />
%G en
%I U.S. National Academy of Sciences Transportation Research Board
%@ 0097-8515
%U http://dx.doi.org/