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Table 5.4 Trunk road area constructed/re-surfaced etc, by unit, 1999-2000
|
Unit |
New road constructed for traffic |
Reconstructed |
Strengthened |
Surface Dressed |
Total |
|
Area | |||||
|
million square metres | |||||
|
Clyde |
- |
0.17 |
0.15 |
- |
0.32 |
|
Forth |
0.04 |
0.21 |
0.11 |
- |
0.36 |
|
Tay |
- |
0.09 |
0.20 |
- |
0.29 |
|
North East |
- |
0.02 |
0.11 |
0.13 |
0.26 |
|
North West |
- |
0.06 |
0.12 |
0.64 |
0.82 |
|
Central |
0.00 |
0.02 |
0.12 |
0.02 |
0.16 |
|
South East |
- |
- |
0.04 |
0.52 |
0.56 |
|
South West |
0.04 |
- |
0.24 |
0.29 |
0.57 |
|
Total |
0.08 |
0.57 |
1.09 |
1.60 |
3.34 |
|
Percentages of total | |||||
|
percentages | |||||
|
Clyde |
- |
30 |
14 |
- |
10 |
|
Forth |
52 |
37 |
10 |
- |
11 |
|
Tay |
- |
16 |
18 |
- |
9 |
|
North East |
- |
3 |
10 |
8 |
8 |
|
North West |
- |
11 |
11 |
40 |
25 |
|
Central |
5 |
4 |
11 |
1 |
5 |
|
South East |
- |
- |
4 |
33 |
17 |
|
South West |
43 |
- |
22 |
18 |
17 |
|
Total |
100 |
100 |
100 |
100 |
100 |
|
Equivalent road lane length | |||||
|
lane-kilometres (estimated) | |||||
|
Clyde |
- |
50 |
43 |
- |
91 |
|
Forth |
12 |
59 |
31 |
- |
104 |
|
Tay |
- |
28 |
57 |
- |
83 |
|
North East |
- |
5 |
31 |
37 |
74 |
|
North West |
- |
17 |
33 |
184 |
234 |
|
Central |
1 |
5 |
35 |
7 |
47 |
|
South East |
- |
- |
12 |
148 |
160 |
|
South West |
10 |
- |
69 |
83 |
162 |
|
Total |
24 |
164 |
311 |
459 |
955 |
Table 5.5 Trunk road Network: Residual Life1 (years)
(a) Residual Life of Pavements (i.e. road surface) as percentage of Base
Network
|
|
Residual Life (years) |
Base2 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 | |
|
(b) Residual Life of Pavements (i.e. road surface) as percentage of Surveyed Network | ||||||||
|
|
Residual Life (years) |
Surveyed3 Network length (km) | ||||||
|
<0 |
0-4 |
5-9 |
10-14 |
15-19 |
>19 | |||
|
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 | |
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
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