Today I ordered some cool LED lights that stick onto the mirrors... look like an orange arrow... just like some of the new high end trucks have.
I often forget to cancell the turn signal ( I'm old )... and there is a lot of ways to do self cancelling lights. But simple is the way for me... so if I have a visual warning..that works! plus the added bonus of outboard lights for those in my blind spot. Here's the link...
This is a good place to shop for GPS mounts & lighting stuff.....
Have a look
http://www.cyclegadgets.com/