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Between these two extremes of roads-those seriously inadequate and those in the main fully adequate- there are, on the basis of traffic volume, 10,374 miles of the rural network with adequate pavement widths and 43,120 miles with inadequate widths. This latter mileage and the 5,090 miles with pavement less than 18 feet wide make a total of 48,210 miles of roads in the entire rural network, as shown by table 7, with existing surfaces inferior in width to the standards prescribed.

Of this 48,210 miles of inferior roads, 18,887 are included in the proposed interregional system and constitute 73.9 percent of its total mileage; and 29,323 miles are outside the interregional system and form 71.0 percent of the total mileage of all other roads in the strategic network.

As table 7 shows, the extremity of inadequacy is reached on 1,037 miles of the network on whcih existing surfaces less than 18 feet wide are subjected to traffic averaging more than 1,800 vehicles per day. Of this extremely inadequate mileage, 361 miles are included in the interregional system. On the entire mileage, the prescribed standards call for 24-foot pavements.

Table 7.—Length of rural roads conforming to main lines of the strategic network surfaced with pavements of various widths inferior to the prescribed standards, by traffic volume classes

Portion of network	Annual average traffic in vehicles per day													Total deficient in width
	0–600		600–1,800			1,800 and over				0–1,800 and over
	Deficient pavement width		Deficient pavement width			Deficient pavement width				Deficient pavement width				Length	Percent of rural network
	Less than 18 feet	18 to less than 20 feet	Less than 18 feet	18 to less than 20 feet	20 to less than 22 feet	Less than 18 feet	18 to less than 20 feet	20 to less than 22 feet	22 to less than 24 feet	Less than 18 feet	18 to less than 20 feet	20 to less than 22 feet	22 to less than 24 feet
Rural roads:	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles	Miles
Included in interregional system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	52	1,107	521	5,433	4,559	361	3,731	2,686	473	934	10,271	7,245	437	18,887	73.9
Not included in interregional system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1,952	4,250	1,528	7,240	7,112	676	2,828	3,067	670	4,156	14,318	10,179	670	29,323	71.0
All rural roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2,004	5,357	2,049	12,673	11,671	1,037	6,559	5,753	1,107	5,090	24,589	17,424	1,107	48,210	72.7
Total deficient by traffic volume classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7,361		26,403			14,456				48,210