Samenvatting
In 1971 a brief questionnaire was given to persons attending the Traffic Engineering Seminar at Lexington, Kentucky. The questionnaire was designed to distinguish between high and low self-testers and to provide a measure of each persons attitudinal profile with respect to a number of controversial issues in traffic engineering. The questionnaire contained three questions designed to elicit self-testing attitudes, questions on luck and game involvement, a.o. The most important block of questions dealt with traffic control decisions. The findings are discussed.