  In face of the threat of a climate catastrophe and the resulting urgent need
for decarbonization together with the widespread emergence of the sharing
economy, shared pooled mobility has been suggested as an alternative to private
vehicle use. However, until now all of its real-life implementations have
served a niche market, adjacent to taxi services. To better understand this
discrepancy, as well as the potential of pooled mobility, we have here
simulated and analyzed pooled mobility on the street network of Berlin with car
trip data as input for ride requests. We measure the rate of sharable trips,
the relative travel time of passengers, the average occupancy of the vehicles,
the relatively driven distance compared to driving with a private vehicle. We
observe that for requests in the city center of Berlin it is possible to serve
all mobility requests currently done by car, with around 4700 vehicles. The
travel time is around 1.34 higher than with a private vehicle, the vehicle's
occupancy increases to 2.6. The driven distance is reduced by 65%. In the whole
area of Berlin we observe that a ride-pooling system with 10000 vehicles can
serve 60% of the trips. The travel time is 1.4 times higher than with a private
vehicle, the occupancy gets three and the driven distance is reduced by 40%.
