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3.3 Road Usage and Road Construction3.3.1 The total volume of travel more than doubled between 1976 and 1988 which isshown in Figure 3.10 together with the changes in road usage by the differentvehicle types. The increasing dominance of goods vehicles is clearly illustrated, andthe reduction in the proportion of road space taken by road-based public transportservices. Of the latter, bus services more than doubled in the period, but public lightbus (PLB) use remained constant. These fixed route public transport services weresupplemented by the growth in special purpose buses (SPB) comprising mainlyschool buses, but also including factory, residential and tour buses.FIGURE 3.10:USE OF ROAD SPACETaxi 1602,16%Goods Vehicle 361734%\yiBus 16917%PLB 112211% f/W PLB 1100*\t?