When it is deemed necessary to test the vehicles on public roads after they have shown to be mostly safe, ALL of these vehicles should have flashing lights like

When it is deemed necessary to test the vehicles on public roads after they have shown to be mostly safe, ALL of these vehicles should have flashing lights like any emergency vehicle. I'm stunned that when I drive in Texas, there don't seem to be regulations over which vehicles can have flashing lights and with which colors. Yet in these other cities you have experimental robots that are designed to blend in with other cars as much as possible. NO! Make them stick out.