bgodette wrote:There's also the possibility of secondary traffic sources (eg Total Traffic Network in the US). I've seen a road "closed" with a TTN notice sitting on top of it. It was closed by setting the average speed to 0 for overnight construction that actually closed the road.
Highly unlikely that any secondary traffic source will cover backalleys in Aachen, Germany - apart from, maybe, the Legendary Apple Locationdata. But then it would cover more than just a part of Aachen, wouldn't it? Also, Total Traffic covers roadclosures - not live trafficspeeds.