photographic techniques have been used to establish flow patterns of southbound traffic on the m6, m5 and m1 motorways and a74, following a similar, but less extensive survey carried out in 1974. data were gathered from selected locations by recording registration numbers on 35 mm film at main sites supported by 16 mm filming and manual recording at other locations. the analysis was carried out by computer programs and involved matching the vehicle registration numbers at various sites. in all, 7383 cars and light vans were identified as passing at least two of the major sites under observation: details of where these vehicles joined and left the motorways are given in the report. for example, of the 15400 cars and light vans recorded on the m1 near luton, 80 had travelled from north of abington in scotland.(a)

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