Now is not a case of whether sitting on a bus is dangerous or not. Now it's danger all the way. Don't care whether u drive or sit bus.

they have tonnes of >1000ps mean machines, capable to exceed 300km/h, but they drive with ethique too.. not like us 

I think the best way to reduce bus driver to speed is -
Salary payment by min
Example : Destination A to B = 2 hours with max 110km

Payment is = 2 hours trip Destination A to B = Rm 80
Payment is = 3 hours trip same Destination A to B = Rm 150
Payment is = 4 hours trip same Destination A to B = Rm 250

Sure those bus driver will driver extremely slow 50km because of it .

Maybe this suggestion wasn't that good.The problem also lies to bus company , sometimes feedback will get ignore since both also involve together , remember last time where a bus driver got 80 plus summon but the bus company ignore them (bribe )

Anyhow , the other good way to fix speed limit issue is to lock the bus speed.Somehow someone mention it just now.
Just underclock the bus to max is 100km will fix it issue.

Second , is the police part , hoping no bribe for this issue , once a bus driver caught of speeding on the spot , terus gantung licensed for 1 month. 3 times gantung , and licensed get cancel + jail.

Third , passenger roll , giving tips will do.All passenger can rate them by giving tips to bus driver who is driving slow and steady during the trip.

Gov set rules , passenger can refund the ticket if they can prove the bus exist the limit 100km.