Dehradun, July 5 -- Besides road caving in at a couple of places along the Delhi-Dehradun Expressway, some other issues also continue to pose problems but the work is stated to be underway on dealing with these issues. National Highways Authority of India (NHAI) has claimed that it has removed three of the six hazardous boulders identified along the elevated section of the Delhi-Dehradun Expressway, while work is continuing to remove the remaining three rocks that are considered a potential threat to the safety of commuters. In view of the ongoing operation, traffic diversions on the elevated stretch have been extended for another week, although two-wheeler movement has been allowed on several sections to minimise inconvenience to commuters...