My dad's S70 has one of those red LED bars at the top of the rear window. It's pretty bright, and it definitely gets your attention. And I would think it would be DOT legal for Volvo to be able to import it. It's an improvement over the previous Volvo he had, an 850. It had the 124 style third brake light at the base of the rear window.

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Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel