The MG Windsor, a six‑seat electric vehicle, slammed into a concrete divider and burst into flames within seconds of the impact.
The occupants were returning from a family gathering in Namburu; Kommareddy Ramdev, 39, his mother Aruna, Tiguru Vijaya, and a child were inside.
Emergency crews found the car completely charred, and they could not revive the victims, while a fifth passenger was rushed to a hospital with severe burns.
Officials say the collision was caused by a sudden loss of control, possibly due to a steering malfunction; an investigation is underway.
The state transport department has pledged to conduct a safety audit of all electric vehicles on the bypass and will introduce stricter enforcement of roadside safety barriers.
The family is demanding accountability from the vehicle manufacturer, and a legal notice has been sent to MG Motor India.