Originally Posted by obr2d2
I believe they indicate road incidents. Not sure where I read this...it may have been in the manual or online.
Thanks Sam, you could well be right. I'm pretty sure there is nothing in the Manual although one example is shown in a map in the 'Navigation' section but unfortunately it is not labelled. They seem to appear fairly randomly. I've trawled the internet for any reference to them without any success.