[Retracted] Layout Optimization Method of Public Service Facilities in Residential Quarters considering Time Distance

Table 2

Scope of road service level division.

Road service level	Da value range
A level	Not more than 1.55
B level	1.55∼2.50
C level	2.50∼3.50
D level	3.50∼4.33
E level and F level	Not less than 4.33