© DawnThree people were injured on Monday when their car and a motorcycle fell into a sinkhole at Khayaban-i-Firdausi, caused by a rupture in a decades-old trunk sewer line. "The road has become extremely dangerous for motorists, as sinkholes can emerge at any time, putting lives at risk. "A sinkhole forms when the ground surface is no longer supported and factors like heavy rain, wastewater flow from broken sewer lines, or the weight of fast-moving vehicles can weaken the asphalt, causing it to collapse," an expert explained. Despite frequent sinkhole-related incidents starting three to four years ago, Wasa only recently prepared a proposal for the replacement of the over 40-year-old trunk sewer line. "But the previous government delayed approval unnecessarily, leaving motorists vulnerable to these dangerous sinkholes," the source criticised.