London Cycling Campaign.
Apparently half of cycling fatalities on London's streets involve lorries and 3/4 of those are construction vehicles. This design lowers the drivers position and gives them much better all around visibility as well as lowering the chassis in attempt to lessen the chances of those struck being pulled under.
Read more about the fascinating and quite beautiful truck here on the Guardian or at London Cycling Campaign's home.
Worth noting that the campaign is not placing all the blame on the drivers. They also give advice on safer cycling around the trucks. I often see riders placing themselves in unsafe positions around trucks at intersections - we have to share the roads and the responsibility. - How to stay safe.