Hi, fellow Grabbers and Sifus.

I'm kind of new as a grab driver. I'm have some issues regarding the charges for toll.

For example:
Some tolls when using touch n go, the teleprompter shows no charges but only a letter "1" and my card remaining value.
- What does that mean? Do i have to charge the passenger? but there's no toll value stated 
- Is the 1 means like, when i enter parking lot and touch means 1? When i exit only charges the amount, which means 2?

Have you guys ever went by a toll but no number shown like "1", also no touch n go balance stated on the teleprompter?
How do you guys proceed when such scenario happens?
Do you guys still charge the passenger? Or not? And if yes, how much? if no why? 

This has been bordering me quite awhile. I scare i overcharge and also afraid im undercharging. 

Please give me your 2 cents, many many thanks !