I think a flashing left arrow, à la ambulances, would get the message across. https://www.fedsig.com/sites/default/files/products/Ambu.jpg https://www.fedsig.c

I think a flashing left arrow, à la ambulances, would get the message across. https://www.fedsig.com/sites/default/files/products/Ambu.jpg https://www.fedsig.com/sites/default/files/products/Ambu.jpg