A tunnel was also constructed under the tracks for pedestrian crossing. Another way is to use portable pedestrian crossing signals. In certain circumstances, there are needs to install temporary pedestrian crossing signals. A third bridge was also proposed to create a new bicycle/pedestrian crossing. The campuses are now connected by means of a pedestrian crossing on the Kilcock Road. The pedestrian crossing opened in March 2010. Oateson Skyline Drive is median divided and contains kerb extensions that promote safe pedestrian crossing. This is especially common for pedestrian crossing lights in high-traffic areas. Some municipalities have push buttons for pedestrians to receive a pedestrian crossing signal. One solution is to provide manually-operated pedestrian crossing signals at each entry. The train also slid into some new pedestrian crossing lights, rendering them unusable. The city even considered converting the rail bridge into a pedestrian crossing at one point. A new hippo plant on the Neckar with a new pedestrian crossing is in development. One example from Miller & Cohen involves a pedestrian crossing the street. In addition, many of the canal locks allow for pedestrian crossing.