![What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing](https://external-preview.redd.it/srFjPkvF_1Ji90VF6xh2uEWiQfEW3sTHzsXHu4i0Kc0.jpg?auto=webp&s=bbc7ce94a0920ef3ec72d02f2f0a3219d97ddf21)
What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing
![What is this black Spinning thing on top of big black van? Ot speeds up and slows down, relative to the vehicle speed. I though maybe self driving radar, but maybe just What is this black Spinning thing on top of big black van? Ot speeds up and slows down, relative to the vehicle speed. I though maybe self driving radar, but maybe just](https://preview.redd.it/wfc65xdyhct11.jpg?auto=webp&s=ba2274a8615ef132c47c1550bf613621a8bee182)
What is this black Spinning thing on top of big black van? Ot speeds up and slows down, relative to the vehicle speed. I though maybe self driving radar, but maybe just
![ULTRAFLOW Low Profile Spinning Van Roof Vent Air Extractor Ventilator BLACK [AVTBLACKVENTLOW] - £44.99 Inc. VAT : AVT Commercial Vehicle Lighting Products - Flashing Beacons, LED Lightbars Van Roof Vents, Commercial Vehicle Products ULTRAFLOW Low Profile Spinning Van Roof Vent Air Extractor Ventilator BLACK [AVTBLACKVENTLOW] - £44.99 Inc. VAT : AVT Commercial Vehicle Lighting Products - Flashing Beacons, LED Lightbars Van Roof Vents, Commercial Vehicle Products](https://www.vehiclelighting.co.uk/bmz_cache/2/2b66ae9e747118131a44a824858719dd.image.720x720.jpg)