A rollercoaster amusement device comprising: - an endless guide structure (1 a, b) at least comprising multiple curves, - a station along said guide structure allowing passengers to board the rollercoaster amusement device, - a carriage displaceable along said guide structure, preferably the carriage having wheels engaging said guide structure, - a passenger assembly associated with said carriage, said passenger assembly being adapted to accommodate at least one passenger in a racing position, which passenger assembly has a frame which is at least provided with a chest support, a back restraining member, and a leg restraining device (31,32,35) for each leg, such that in the racing position: - the passengers head is directed forward, - the passengers trunk resting with its chest side on top of the chest support, - the back restraining member restrains motion of the passenger away from the chest support, - the leg restraining device hold each leg such that the upper leg is angled downward with respect to the trunk and the lower leg is angled rearward with respect to the upper leg, wherein the passenger assembly is adapted to accommodate two passengers in a side-by-side arrangement, characterized in that the passenger assembly has a suspension arm which is suspended from said carriage, and wherein the passenger assembly further has a lateral spreader beams mounted on said suspension arm and each extending laterally from said suspension arm in opposite directions, each lateral spreader beam supporting a central frame structure provided with the chest support and leg restraining devices (31, 32, 35), wherein the suspension arm is connected to said carriage by a pivot having a pivot axis essentially in longitudinal direction of the guide structure, such that said assembly will swing in pendulum fashion as the carriage passes through a curve of the guide structure. - an endless guide structure (1 a, b) at least comprising multiple curves, - a station along said guide structure allowing passengers to board the rollercoaster amusement device, - a carriage displaceable along said guide structure, preferably the carriage having wheels engaging said guide structure, - a passenger assembly associated with said carriage, said passenger assembly being adapted to accommodate at least one passenger in a racing position, which passenger assembly has a frame which is at least provided with a chest support, a back restraining member, and a leg restraining device (31,32,35) for each leg, such that in the racing position: - the passengers head is directed forward, - the passengers trunk resting with its chest side on top of the chest support, - the back restraining member restrains motion of the passenger away from the chest support, - the leg restraining device hold each leg such that the upper leg is angled downward with respect to the trunk and the lower leg is angled rearward with respect to the upper leg, - the passengers head is directed forward, - the passengers trunk resting with its chest side on top of the chest support, - the back restraining member restrains motion of the passenger away from the chest support, - the leg restraining device hold each leg such that the upper leg is angled downward with respect to the trunk and the lower leg is angled rearward with respect to the upper leg,