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Table 5.5 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 |
|---|
(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 | 632 | 5.2 | 949 |
|---|
2003-04 | 9.0 | 632 | 5.1 | 949 |
|---|
2004-05 | 9.2 | 632 | 3.9 | 949 |
|---|
2005-06 | 6.7 | 632 | 3.2 | 949 |
|---|
2006-07 | 6.1 | 632 | 2.7 | 949 |
|---|
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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