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Figure T V 7. 3_ Jbetween cumulat h e number of commerciat _ vehiclescarried by each stow lane_ and design ^ life,—Growth rate 5 per cent90oX80Initial t rcf f i c .Commercial vehicle/dayin each direct ionJL-i2 500 —yco3:o70JC oO60co^ 502 40o U6c2030>4»*JO101ODesi gn life20 30(years)

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