sentences:  Original plans drawn up in the late 1990s for converting the A41 to a dual carriageway and bypassing Aston Clinton included a low level crossing of the canal, which would have prevented restoration.However, negotiations resulted in the Highways Authority funding a diversion of the canal to a point where there was sufficient headroom for navigation.The Trust argued that an pipe to carry away rain water from the road would be insufficient in storm conditions, and that excavating of new canal would be a better solution.