James Farrar typed


A deeper 'uh-oh' sound, as featured on many quiz shows, might be more
effective...

We asked 100 people if your Oystercard was valid, and our survey
said...

I rest my case. I genuinely think an 'uh-oh' sound might wake both
passenger and driver. The current sounds are not effective this way.

I'm genuinely concerned that when/if the £50 Penalty Fare is introduced,
some people might get tripped up unawares.

--
Helen D. Vecht:
Edgware.