新手如何判断车距

[[{"txt": "\u6211\u662f\u4e2a\u65b0\u624b\uff0c\u521a\u5f00\u59cb\u5f00\u8f66\u603b\u662f\u7f3a\u5c11\u70b9\u8ddd\u79bb\u611f\uff0c\u53d8\u9053\u548c\u8ddf\u8f66\u65f6\u5bf9\u524d\u540e\u8f66\u8ddd\u603b\u662f\u628a\u63e1\u7684\u4e0d\u662f\u5f88\u51c6\u786e\u3002\u00a0\u540e\u6765\u5728\u7f51\u4e0a\u770b\u5230\u4e2a\u89c6\u9891\uff0c\u8bb2\u4e86\u4e00\u4e9b\u5224\u65ad\u7684\u65b9\u6cd5\uff0c\u628a\u5750\u5728\u8f66\u5185\u7684\u89c6\u89c9\u611f\u8d4b\u4e88\u4e86\u5b9e\u9645\u7684\u8ddd\u79bb\u3002"}], [{"txt": ["\u6b65\u9aa4/\u65b9\u6cd5"]}, {"txt": "\u00a0\u00a0"}, {"txt": "END"}]]