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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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