Every traffic sign conveys a single proposition about traffic conditions. Drivers must integrate
this proposition with their goals and other known facts to decide on an appropriate action in
what amounts to a deduction task. For example, imagine that you are driving a car and you
want to turn right at an intersection but there is a no right turn sign. You have to assess the
options and make a decision (reach a conclusion). Theoretical accounts from research
about reasoning can be applied to how we understand traffic signs and make inferences …