Well, it must have been due to a untightened screw. Lucky they didn't come off, or he'd have had to tripod his way home (first Hyundai rickshaw).
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1. Dunno how the driver was not able sense it
It's always the case when it's a problem with te rear wheel. Since the driving and the steering wheels are at the front, there' absolutely no feed back from the rear ones. I've had 2 flats from the rear tyres of my Wagon R and in both cases, i never realised it. I felt no difference as i was driving in city conditions at low speeds.