Scottish Transport Statistics No 29: 2010 Edition

Has figures on (e.g.) road vehicles, traffic, accidents, bus and rail passengers, road and rail freight, air and water transport, finance, personal travel and international comparisons.


Table 4.5 Trunk road network: Residual Life 1 (years)

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

Residual Life (years)

Surveyed 2,4
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

2003-04

4

4

6

7

12

67

4,048

2004-05

4

5

6

7

13

65

4,048

2005-06

4

4

6

7

15

63

4,048

2006-07

5

4

6

7

15

63

4,048

2007-08

4

4

7

7

13

65

4,048

2008-09

4

4

6

7

11

68

4,048

2009-10

5

5

7

8

11

64

4,048

Source: Transport Scotland - Not National Statistics

(b) The proportion of the motorway/dual carriageway trunk road network, which require close monitoring 3

Motorways

Dual carriageways

Requires
close
monitoring

Length 4 of
network
surveyed

Requires
close
monitoring

Length 4 of
network
surveyed

%

(km)

%

(km)

2002-03

7.5

631.5

5.2

949

2003-04

9.0

631.5

5.1

949

2004-05

9.2

631.5

3.9

949

2005-06

6.7

632

3.2

949

2006-07

6.1

632

2.7

949

2007-08

8.2

632

3.9

949

2008-09

4.3

632

4.1

949

2009-10

6.3

632

5.5

949

Source: Transport Scotland - Not National Statistics
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. Surveyed network is the length of the network which has been surveyed and which was increasing year by year until the target of complete survey coverage was achieved. Therefore, these figures may 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.
3. The part of the network that requires close monitoring is that which has a residual life of less than zero.
4. Network length is carriageway kilometres, i.e. 10km of dual carriageway counts as 20km, hence the difference from Table 5.1.

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