Unless you find it fun going sideways at 60mph on a freeway, I will suggest from experience , leave the EB off when your in weather which prevents 100% traction...I was going w/b on I-40 in New Mexico in what was light rain, temps dipped to the low 30's and traffic started slowing. I forgot I had the EB on because I was using cruise control.(another bad idea in less then lovely weather) Turned off CC, back end started to fish tail as soon as the EB kicked in, causing a "pucker factor" I had not experienced since my early days as a young COP in vehicle pursuits over 100 MPH... Luckily I managed to keep her straight and off the EB went...