To build a motorway, the route could not remain at ground level. To achieve full grade-separation, and because of the challenges of sinking the route below ground level,
the entire road was to be elevated. It was recommended that much of the land underneath could be made available for service industries or other purposes - one architect's sketch showed
the LIM running on the roof of a shopping centre - and in some places, buildings could be constructed over and under the road (imagine
a building with a hole in the middle, through which the motorway passes). The details of a suitable design to elevate a motorway without being too obtrusive was solved by designing the support piers at this early stage.
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