Instead of trams, with the necessity to spend millions on laying tracks, why are trolleybuses not preferred?

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27 January
17:28
8 March
15:59

1) Takes more space - a bus by virtue of being on wheels means it needs more space. For big cities where space is limited, a light rail system saves space. 

2) Safer - trolleybus requires more control from driver, and more % for accidents. 

3) Less energy: Light rail has less friction than trolley bus, so it takes less energy from the grid (depending on models ofcourse). 

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