A video of the incident that occurred in Woodlands was uploaded on Facebook on April 18.
It showed a blue Volkswagen Scirocco travelling along Woodlands Avenue 9 next to Republic Polytechnic signalling right and overtaking the cam car.
Once the overtaking car managed to filter into the right lane, it flashed its hazard lights twice.
Grateful for small gesture
This practice of "blinking" momentarily is a thank you gesture for inconveniencing the car behind and was popularised by the Japanese.
The caption on the post expressed thanks to the "humble and grateful driver who uses his signals" as he "even did the famous Japanese 'thank you hazard'".