在道路网规模方面，首先从道路网密度、道路面积率和道路等级级配等角度，对我国大城市道路网规模的发展现状进行分析；
To the scale of road network , firstly , this paper analysis the actuality of our big citees ' road network scale from the angle of road network density , road area ratio and road level arrangement .
道路面积率