关于road的类别，作者给出了说明如下：
Part of ground on which cars usually drive, i.e. all lanes, all directions, all streets. Including the markings on the road. Areas only delimited by markings from the main road (no texture change) are also road, e.g. bicycle lanes, roundabout lanes, or parking spaces. This label does not include curbs.
但是实际上标注的时候遇到路上有停车场就很迷惑，比如如下图所示
关于parking，cs的划分标准如下
Parking lots and driveways. Not for regular driving, but rather to park a vehicle. Different texture than road. In ambiguous cases where the driveway is not separated from the sidewalk (e.g. a building entrance), labeled as sidewalk.
所以有必要弄清楚cityscapes对于这种类别是如何标注的。为此我们特意下载了cs，并且查找类似的案例
上图怀疑是停车的那部分路到头了，所以可以理解为停车场
