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Apart from Essen the only other German city to have used the kerb guided O-Bahn system was Mannheim, where buses shared a pre-existing surface light rail private right of way. Installed in April 1992 this 800 metre installation helped city-bound vehicles to bypass traffic congestion leading up to a busy traffic signal controlled junction in a location where there was no space for an extra traffic lane. (Out-bound vehicles use[d] the public highway). The trackage used here consisted of longitudinal wooden beams and steel guidewalls as developed in Essen for where trams and buses share formation. Compared to wooden track in Essen the ride quality of a Mannheim kerb guided bus was considerably better, however Mannheim's track had more and sharper curves which together with the four guide-wheels (one next to each of the front and rear road wheels) gave an impression of almost 'bouncing' between the buses' four corners! In the event the distance was so short (and the already slow moving
