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The results for all gaps are compared for subjects using rollators, hand wheelchairs, electric wheelchairs and scooters, see figure below. Most of the rollator users are able to overcome all gaps. Gaps with larger height difference are handled by lifting their rollator as a whole. Turning the rollator over is not an option, since it has been constructed to lean on it, thus requiring a very high stability. The problems for electric wheelchairs are building up gradually whereas those for scooters are present only at gaps that are both wide and high. The forward speed is no longer sufficient to get the wheels with a diameter of about 20cm across the gap. Some of the hand wheelchair users still manage, because these can lift up the small front wheels and develop sufficient speed for the large rear wheels to cross the gap. This does however require a well-developed arm musculature.
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