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A petrol promotion on Sunday afternoon resulted in traffic jams across parts of Singapore, much to the irate of affected drivers.

Shell's 44-cents discount per litre between 4 to 5pm today - in conjunction with National Day - reportedly caused jams along Bukit Timah, Choa Chu Kang and Upper Thomson road, online netizens said.

Reader David told citizen journalism website Stomp that he was held up in a 50-minute jam after exiting the Choa Chu Kang exit along the Kranji Expressway (KJE).

"The road was totally choked by cars and I wasn't even able to move an inch. It jammed all the way to the KJE highway exit," he said.

David also added that he was led to the petrol station after being stuck in traffic and "wasn't able to go straight".

"Then after a while, the officer-in-charge was telling the car drivers' one by one that the promotion was over.

"Even though the promotion was over, the cars were still queuing up!"

Another netizen, Yoda Jedi, said queues outside the Shell petrol stations created a jam along Upper Thomson road going both ways.