pendent variables. The violators scored higher than the students on the driving behaviors scale
with t 139  2:14, p < :05. The violators also scored higher than the students on the seven-item
attitude scale, with t 139  3:10, p < :01. The violators scored higher on the summated type-A
behavior pattern items, with t 139  3:40, p < :01.
D.E. Miles, G.L. Johnson / Transportation Research Part F 6 (2003) 147­161 155