"But I am confident F1 and the teams have taken action after a year ago".
Governing body the FIA says a series of measures have been taken to ensure F1 personnel are at reduced risk leaving the circuit, a time at which incidents have become increasingly common in recent years.
"They took action to try and put things in place to improve it and I am assured", Hamilton said. "We don't know what's around the corner but I am hopeful of a positive weekend for everyone".
Hamilton sealed his fifth drivers' title at the last race in Mexico.
To allow him to drop that guard, Hamilton and Bottas must out-score Ferrari's pair of Sebastian Vettel and Kimi Raikkonen by 13 points, but this season has seen them achieve that only twice so far in 19 attempts.
"We have such a huge respect for each other.it's the greatest partnership in terms of respect and teamwork from drivers that has ever existed in Formula One probably".
"We have got the vehicle back to what we know and what we feel more comfortable with at the last two races", said Vettel in the Brazil paddock, "so hopefully we can keep that up and keep competitive here and in Abu Dhabi and give [Mercedes] a very hard time".
Hamilton will be hoping to secure the constructors' title for his team this weekend. Probably '09 was the worst one and the lowest point. "There's a lot of work to do, even at this point of the year".
Asked about Ferrari's costly dip, Vettel said: "It's a big question".
Hamilton has since wrapped up his fifth drivers' title, which means Bottas is now free once more to challenge his team-mate in the two remaining races of the campaign. "The team are not going to make that call", he said.
"It's not something I've asked Valtteri, if he'd want that, but I don't think he's going to want that". He's going to want to win in his own way. So I don't know if I'll be doing him any favours in the sense of giving him a win, I don't think he needs that.
"I am not going to be here if it gets to 25 races, that's for sure", said the Mercedes ahead of the Brazilian Grand Prix. "I'm always really open with my set-up, so I'll continue to do so".
"I still have a mission here and I still want to win".
"One of the most hard moments of the year was in Russian Federation for me", he had said in Mexico City, referring to a race in which Bottas was asked to move aside to let him win.
Hamilton hailed Bottas' contribution after winning the championship in Mexico, and has emphasised how well they get on as teammates. We don't have enough power. And with the downforce we have on the cars the corners are all a bit more easier. "There is not much we can do".