I would say it's not 2-wheelers, but young guys. especially students. Most of my local friends don't even bother to stop, it us innocent people who get in trouble.
Coming to this particular issue - Well there is always a differential speed limit for different type of vehicle. on GQ its mentioned, and yes it is 60kmph for 2-wheelers. But I don't recall any such sign on Hebbal-Devanhalli route.
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