I will discuss what happens in a transportation network when travel times are uncertain and users who want to route between their respective sources and destinations are risk-averse.  I'll propose a measure of quantifying how much the degree of risk-aversion degrades the system performance (measured as the total expected delay of all users), separately from the effect of selfish routing choices of the users. I will conclude with the effect of user diversity on the quality of the resulting traffic equilibria, and specifically when diversity of user preferences improves outcomes in selfish routing.