The experts wondered whether such dollies are approved to UNR79: there are mainly approved to national regulations, yet there are different types of dolly steering systems. The experts acknowledged that rigidity is usually beneficial to stability. Krone did marketed some steered dollies. The experts were informed that S does not allow the Krone solution (drawbar + front axle). The chair informed about his hope that the group find acceptable solution toward harmonization.

The problem of in-use requirements (roundabout radius are different in the different countries) was raised. S stated to be ready to amend their national legislation for the sake of harmonization.

Mr. Adam committed to contact M. Hüdepohl (Krone) to check his experience on such dollies.

Mr. Adam subsequently transmitted the answer of Mr. Hüdepohl:
“All approvals are single approvals in Germany, production is about 25 units/year. Nearly all of them are used under the umbrella of the BASt running test. These dollies were introduced for fulfilling the manoeuvrability requirements. Experience is very good. The ball bearing turntable improves the stability on normal roads rather than on icy conditions. The front axle of the dolly is locked above 60 km/h (steering is mechanically controlled by the angle of the drawbar).”