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Work on installing LED lights and exhaust fans have been completed.
The vehicles enter the tunnel with their headlights on during the day and night.
This would mean the traffic snarls in Kuthiran will continue to be a headache for commuters in the scorching summer.
Officials expect that the works, including the concreting, will be completed in four months.
The incident took place at 8:50pm on Thursday on tunnel No 1 towards the Thrissur direction.
Vehicles on the National Highway will be allowed to commute in either direction of the first tunnel to facilitate the construction of the second tunnel which is due to open next year.
The 964-kilometres-long twin-tube tunnel is Kerala's first ever tunnel for road transport.
The twin tunnels are along the Mannuthy-Wadakkanchery stretch on the NH 544 between Thrissur and Palakkad districts.
A high-level team headed by Regional Fire Officer S Sreejith carried out the final round of inspection ahead of the much-delayed opening of the tunnel towards Thrissur for traffic on August 1.
The accident occurred after a goods truck lost control and rammed into two cars and two motorcycles. The truck then hit a mini lorry.