The Department for Transport has been keen to cut running costs and turning off the lights has been successfully tested on parts of the M2，M4，M5 and M27.Switching the lights off is also seen as having the additional advantage of cutting carbon emissions.Similar initiatives have been tried by a number of local authorities on local roads with mixed results.

　　Powys Council in Wales was forced to ditch its experiment of turning off more than half its 1,400 lights off at night after a wave of protests from the public.Elsewhere many councils have chosen to install equipment which dims lights rather than switching them off altogether.

　　However，Derek Turner，the Highways Agency director，defended the move and insisted motorists would not be put at risk.“Since 2009 we’ve switched lighting off between the hours of midnight and 5 am on 14 carefully­selected motorways and evidence so far shows that switching off the lights hasn’t had an impact on safety，”he said.“In March this year we also began permanently switching off motorway lights at three sites.The money saved could then be used for other measures on the strategic road network where it would have a more significant safety benefit and potentially save more lives.”

　　在英国，有关部门打算从午夜到凌晨五点期间关闭部分高速公路上的灯，对于这种做法，众说纷纭。

　　5．What do we know from Paragraph 1?

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