When the motion is stopped, the user can turn the camera from street to street by inputing horizontal gestures. When the camera is located at a crossroad, right and left gestures result in orienting the viewpoint towards one of the connected streets. When the camera is stopped somewhere in a given street, these gestures imply a rotation of the camera to the opposite direction. Technically, this consists in looking for the adjacent nodes in the street network. The current street that has been selected and that faces the camera is highlighted with a blue line displayed on the ground, as illustrated in Figure 1(d). This provides a visual feedback to the users allowing them to know what is the current state of the system.