They have those lines on taxi slips here in .fi, too...
...but every driver I've ever talked to -- I've tried to leave a tip that way more than once, because, you know... One isn't always at one's best when one has to take a taxi home -- they all say that doesn't work, and that I just won't get billed that extra amount. Which has turned out to be correct in those cases where I'd already got around to adding something on as I was signing the slip, AFAICR.
I'm thinking maybe that's some stone-age remnant on the slips, a relict of how the system *used* to work -- but they don't do that any more, because of the risk of fraud (by the staff at the selling establishment).
Anybody know better?
[link|mailto:MyUserId@MyISP.CountryCode|Christian R. Conrad]
(I live in Finland, and my e-mail in-box is at the Saunalahti company.)
Ah, the Germans: Masters of Convoluted Simplification. — [link|http://www.thetruthaboutcars.com/?p=1603|Jehovah]