Police have issued about 100 summonses to factory bus drivers who obstructed traffic at the Bangunan Sultan Iskandar Customs, Immigration and Quarantine (CIQ) Complex, here on Aug 1 following the imposition of new toll rates.

Johor Baharu South deputy police chief Supt Mohd Nadzir Ghulam Kadir said all of them who parked their vehicles by the main road shoulder would be investigated under the Road Transport Act 1987.

"They deliberately disappeared after locking their buses before returning to assemble later.

"The act had created inconvenience to other road users and left bus passengers stranded," he told reporters, here today.

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Mohd Nadzir said in this regard, police had open an investigation paper under the Peaceful Assembly Act 2012.

He said it was the top priority of the police to ensure smooth traffic flow on all roads.

According to him, police had been monitoring the situation at the CIQ complex with the cooperation of the Road Transport Department, Land Public Transport Commission, Malaysian Highway Authority (MHA) and the Eastern Dispersal Link (EDL) expressway.

"Road users are reminded to adhere to regulations and parties unhappy with the new toll rates were told not to create problems and should discuss with the authorites on the issue," he said.

Meanwhile, traffic at the CIQ complex proceeded smoothly without any hitch.

In the Aug 1 incident, 200 bus drivers refused to enter Singapore causing a massive traffic congestion at the CIQ complex from 4am for four hours causing thousands of stranded workers to walk across the causeway to catch a bus at Woodlands.

The incident was believed to be due to the MHA's announcement of new toll rates on entering and exiting the CIQ complex from Aug 1.

Earlier, Singapore also announced an increase in the fees for its Vehicle Entry Permit and Goods Vehicle Permit effective on the same day.