The accident took place when the driver lost control over the vehicle after he failed to negotiate a sharp curve, police said.
Three persons died on the spot, while another succumbed to his injuries at a hospital in Solan. The seriously injured person was referred to PGI, Chandigarh, ASP Manmohan Singh said.
The deceased have been identified as Kartik Kaundal, resident of Nauni (Solan), Rohit Kumar of Chail, Tanissk Thakur of nearby Gadasar village and Sanjay of Ochhghat (Solan).
A case has been registered and investigation is on, Singh said.
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