The sign reads
“Strictly No Food & Drink”
“Please do not litter”
“Please do not yell and shout as your high decibel will distract the driver concentration”
I probably shouldn’t but it’s the third one I find amusing.
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Expat Bostonians 
the 3rd one is soooo hilarious! Never seen anything like this before.
Me neither, which is why immediately made it blog worthy 🙂
Funny!
You just never know what you’re going to see in the back of a singapore cab!