Gurugram, Oct. 11 -- A 33-year-old man was killed and at least five others were injured after a speeding trailer truck travelling downhill rammed multiple vehicles during a snarl on Delhi-Jaipur Expressway in Manesar on Thursday night, said police on Friday. Investigators said that the deceased was Sandeep Kumar, 33, of Barna in Kurukshetra. He was working as a senior engineer at an automobile manufacturing firm. The critically injured people were his colleagues, Vinay Kumar Gupta, 32, of Bajali colony in Faridkot, in Punjab; Sumit Kumar, 34, Rajiv colony in Fatehabad; their cab driver Surender Kumar, 46, of Mahendragarh, both in Haryana. Drivers of two more cars and the trailer were also injured in the accident, said police. Police said due to the snarl, it took time for the cranes and emergency response vehicles to reach the spot to take out the injured people from the crumpled cab. The four were rushed to a private hospital in Manesar but doctors declared Sandeep dead on arrival. After hitting the three cars, the trailer veered off course and toppled after falling into the ditch between the service lane and the main carriageway. The occupants of the remaining two cars were rushed to different hospitals, the trailer driver had fled from the spot. Police said the deceased was a senior engineer working with the research division of the Hero MotoCorp in Jaipur. The deceased and his colleagues had reached Dharuhera in Rewari for inspection of their manufacturing plant after a visit from their Neemrana plant in Rajasthan. Police said the trio were travelling in a Swift Dzire to further reach the Gurugram plant of the firm when the accident took place at 9pm on Thursday. Sandeep Turan, Gurugram police PRO, said, "There was a snarl on the expressway and the entire traffic was moving slowly. The trailer driver had likely fallen asleep or lost control after brake failure which resulted in the accident," he said, adding they were trying to trace the trailer driver and arrest him soon. An FIR was registered against the unidentified trailer driver at Manesar police station on Friday....