[Huliwang]

Long distance buses are aso not totally safe. Which rows are safer in case of accidents ha? Front rows can exit faster, but the impact is aso greater

Yes, long distance from Singapore to Penang by bus is sure dangerous especially a large portion of the trip is done at night at rather high speed. 
I ever took a bus from Guangzhou to Swatow where the bus passed through quite mountainous, bumpy and rough terrain. Lucky the journey was done during daylight hours leaving Guangzhou around 0600 hrs and arriving Swatow around 2000 hours. Again, I will never do such stunt again......