found online by Raymond
From The Journal of Improbable Research:
Researchers Francisco Alonso, Cristina Esteban, Andrea Serge and Mª Luisa Ballestar at INTRAS (University Research Institute on Traffic and Road Safety), University of Valencia, Spain, have performed a new study on shouting and cursing whilst driving.
“The aim of this study was to describe the factors and perceptions related to aggressive behavior of verbally insulting and shouting out while driving. In this study, it was described an extensive list of behaviors that experts consider more or less unanimously as ‘aggressive driving’, one of them described as shouting and insult.”