Formula One's younger drivers have been warned to beware the dangerous conditions expected in qualifying at next week's Monaco Grand Prix.
Montoya was penalised in 2005 for his speed at Casino Square
Monaco is the slowest Grand Prix, but crashes can easily happen when drivers are unsighted on the twisty streets.
Williams' Mark Webber added: "Monaco is just so bad - you can't see where the cars are on the track."
"People must be sensible enough not to have huge speed differences - that's the bit that worries."
This season's qualifying promises to be hectic, with drivers running together on the track to a knockout format.
It is a major change from the last three seasons, when drivers had just one lap to set their time but they ran alone on the track.
BMW Sauber's Jacques Villeneuve, who was involved in a crash during practice at the track last year, said: "Monaco will be hell."
Webber added: "At Monaco you actually have nowhere to go if you back off in certain areas, and you don't want to be learning about that in qualifying.
"The experienced guys know the score but every so often you get caught out."
McLaren's Juan Pablo Montoya was sent to the back of the grid last year when he dropped his speed from 278kph on the previous lap to a mere 86kph on the fast approach to Casino Square.
Rivals accused him of doing it deliberately to get his own back at being impeded on a previous lap, something Montoya denied, but the consequences were nearly catastrophic.
Villeneuve, coming up behind in his Sauber, was unsighted and ploughed into the back of David Coulthard's Red Bull.
Most exciting qualifying
Webber's team-mate Nico Rosberg will be one of the new faces on the starting-grid.
And the experienced Australian said: "We have told a few rookies that if you do back off at all, you have to look in your mirror after every corner because a car can be on top of you that quickly."
Honda team boss Nick Fry said: "Monaco is probably going to be the most exciting qualifying of the year.
"It really is going to be a matter of who avoids the incidents and who manages to not get baulked."