^a/ Cavite,Laguna,Batangas,Quezon
^b/ The decrease of the length of National Roads in National Capital Region is
^b/ due to the correction/revision of the length of some dual carriageway
^b/ road sections and the non-inclusion of North/South Luzon Expressways.
^*/ Data for 1996 includes the newly converted national roads.

Unit: In Various Units
Last Update: Jan. 1998
Source: Bureau of Maintenance