Toyota driver Jarno Trulli says he has concerns about the running of the Singapore Grand Prix ahead of Formula One's first ever night race this month.
The Singapore street circuit will host the sport's first floodlit event on 28 September, but the drivers will not take to the track before Friday's practice sessions.
Trulli said the drivers are in the dark about the new circuit, and he admitted he is worried that the race may not be as trouble-free as the European Grand Prix at the new Valencia street circuit.
The Italian admitted the possible poor weather is also a worry.
"The normal Singapore concern is that it is a new circuit, we don't know much about it - the schedule, the times of running, and we are all a little bit concerned about the night race and poor weather that might occur there," Trulli told reporters at Spa on Thursday.
"It is a big question mark for everyone. We don't have to underestimate that situation.
"It would be nice to know more about it to get a better idea but until we get there we probably won't know."
"To be honest I am not in the FIA committee and I don't know much about it, we don't have much information about it. In Valencia they did a good job so I am confident they can do a similar job for Singapore but the location is different and climate condition is different, and the running time is different.
"No experience at all for anyone, and in a new circuit. It is all a bit of a question mark."
Trulli admitted he would have welcome a practice session on Thursday, something that was ruled out earlier this year.
"It is not a question of learning the circuit," Trulli added. "You saw what happened to me in Valencia, I didn't do any running on Saturday morning and then I ran enough on Friday and got it right for qualifying.
"The problem is to try and get an idea of what are the circuit layout problems, and if you can solve it through the weekend before any bad accidents happen.
"In Valencia they did a race before so they cured some of the problems they found during this event, which might not happen in Singapore. That is a good point and I am a little bit concerned.
"It would be nice to have a Thursday free practice and also to point out the eventual problems of the circuit."
He added: "We are all a little bit uncertain because we don't have enough data. The circuit layout? I haven't seen it, but that isn't the problem. The problem is we don't know if the circuit is good enough, if the surface is good enough or if we have enough running off area.
"If the surfaces is good enough for a night race in case of wet conditions, which could be a case there. In Valencia they experience during a pre-race event, and in Singapore not.
"There are several question marks and several concerns. I am not saying I don't want to race there, but I am saying we might encounter some more problems compared to Valencia. I hope that everything will be alright."