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Scottish Transport Statistics No 22 - 2003 Edition

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SCOTTISH TRANSPORT STATISTICS No 22 - 2003 Edition

Table 5.4 (a) Trunk road constructed/re-surfaced etc, by unit, 2001-02

Unit

New road constructed for traffic

Reconstructed

Strengthened

Surface Dressed

Total

Equivalent road lane length

lane-kilometres (estimated)

NW

..

-

27

23

50

NE

..

20

28

23

71

SW

..

20

92

3

115

SE

..

13

62

10

85

Total

..

53

209

59

321

Percentages of total

percentages

NW

..

-

13

39

16

NE

..

38

13

39

22

SW

..

38

44

5

36

SE

..

25

30

17

26

Total

..

100

100

100

100

Table 5.4 (b) Trunk road constructed/re-surfaced etc, by unit, 2002-03

Unit

New road constructed for traffic

Reconstructed

Strengthened

Surface Dressed

Total

Equivalent road lane length

lane-kilometres (estimated)

NW

..

5

31

38

74

NE

..

11

12

20

43

SW

..

4

127

65

196

SE

..

15

62

4

81

Total

..

35

232

127

394

Percentages of total

percentages

NW

..

14

13

30

19

NE

..

31

5

16

11

SW

..

11

55

51

50

SE

..

43

27

3

21

Total

..

100

100

100

100

Table 5.5 Trunk road network: Residual Life 1 (years)

(a) Residual Life of Pavements (i.e. road surface) as percentage of Base Network

Residual Life (years)

Base 2
Network
length (km)

<0

0-4

5-9

10-14

15-19

>19

percentages

1994-95

4.7

6.9

11.9

12.8

16.1

47.6

417

1995-96

6.5

9.5

11.7

12.3

14.9

45.1

417

1996-97

6.9

9.8

13.5

13.3

16.6

39.9

417

1997-98

8.0

12.7

16.6

15.8

15.7

31.2

417

1998-99

7.9

12.3

14.2

17.1

18.1

30.4

417

1999-00

5.5

10.0

15.2

14.6

20.1

34.0

417

2000-01

7.7

10.6

14.7

15.3

14.9

36.8

417

2001-02

8.4

8.0

13.3

12.7

14.0

43.6

417

2002-03

9.2

8.8

12.7

13.3

20.5

35.5

417

(b) Residual Life of Pavements (i.e. road surface) as percentage of Surveyed Network

Residual Life (years)

Surveyed 3
Network
length (km)

<0

0-4

5-9

10-14

15-19

>19

percentages

1997-98

11

8

11

8

8

54

1,285

1998-99

10

9

9

8

7

57

1,461

1999-00

10

8

10

9

10

53

2,123

2000-01

9

7

9

8

8

59

2,545

2001-02

4

4

7

7

10

68

3,617

2002-03

4

4

7

7

11

67

4,048

(c) The proportion of the motorway and dual carriageway trunk road network, which require close monitoring 4

Motorways

Dual carriageways

Requires close monitoring %

Length of network surveyed (km)

Requires close monitoring %

Length of network surveyed (km)

2002-03

7.5

631.5

5.2

949.4

1. Residual life represents the number of years to elapse before the pavement reaches the stage when it may be necessary to undertake relatively more expensive reconstruction rather than strengthening to restore its full life.
2. The Base network is a fixed sample of roads which are surveyed every four years.
3. Surveyed network is the length of the network which has been surveyed and which is increasing year by year as the target of complete survey coverage is achieved. Therefore, these figures do not represent the current position in each of the years, and apparent year-to-year changes may be due to the expansion of the surveyed network - see paragraph 4.2.2.
4. The part of the network that requires close monitoring is that which has a residual life of less than zero.

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