At its northern limit as now constructed the M74 Motorway described in the Paper reaches within 2 miles of the Glasgow city boundary or about 7 miles from the city centre. Considering the semi-urban nature of much of the area traversed, the clearance of property was remarkably low. There were only 14 inhabited dwellings affected in the total length of 14 miles. The price which had to be paid for land and buildings was minimal but not so the cost of the earthworks, as the route which had to be followed traversed the soft alluvial deposits referred to in the Paper for a cumulative length of 63 miles. M r D. D. FraserI would like to mention the flooding problem in the Hamilton Low Parks. With a normal maximum flood of 50 OOO cusecs, the whole area is inundated. Even with much smaller floods of the order of 20 000 cusecs, the extent of flooding approaches quite closely to what is shown here, and a flood of 20 000 cusecs is the type which can be met with in this area on an average of about once every year or two years. It will be seen from this that it was essential that the motorway and the interchange and the slip road had all to be built on embankments to keep the works above flood level. 98. The 10 in. composite base was found to be the most economic for this motorway and, I believe, has proved to be the most economic for motorways in Scotland generally. Bitumen bases have not so far been used to any great extent except in short lengths where speed of construction is important. As far as I know, asphalt bases have not been used at all. This is something which surprises us. 99. Similarly, concrete roads are not popular in Scotland and the length of two miles carried out on this motorway was really a trial length. The Paper records the test results for bituminous surfacing. Now that the whole motorway has been completed, I can show the final results for Stages 1 and 2 in Table 4.100. The method of placing bituminous test results in three categories (in compliance with specification, slightly out, and really unacceptab1e):is well known. It will be seen that the test results on Stage 2 are rather better than they were on Stage 1. This is because a longer period was available for laying surfacing and also, I think, because we were getting to grips with the problem to a greater extent.101. Even so, the percentage of passes falls far short of 100% compliance, but I think it is generally accepted that IOOZ, compliance is an unreasonably high standard to ask for. Indeed, figures of 70, 20 and 10% for the above categories are suggested quite often. The average for all materials on Stage 2 was 66, 28, and 604.
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