I thought that the car chase scene from Bullitt was, and still is imo, hands down the best car chase scene in a movie of all time. Not saying that it can't be beaten, but I think that will be quite difficult to do as most new movies shoot the cars driving at 25-30 mph or whatever but have the camera rolling alongside or use certain angles and cutaways to make it seem like they're driving really fast when they obviously aren't. They'll use exhaust sounds that are clearly not from the cars involved in the scenes and the realism just isn't even close. Like how a car will easily keep up with a motorcycle that is considerably lighter and faster, especially with regards to acceleration. The thing that impressed me so much about Bullitt is that it actually felt like you were there in the cars with them, that they were actually doing the stunts and driving crazy speeds and without any CGI or crazy special effects, because obviously they didn't have that technology available back then. They had to drive faster for the realistic effect as well as the car crashes and so forth.
Obviously it's not a perfect car chase scene with all of the hubcaps flying off, the same VW beetle being used multiple times as well as other vehicles, the charger actually driving around the gas station and never actually hitting it and so forth. But it looked and felt imo much more real than any other car chase scene since then that's loaded with CGI, special effects and a bunch of other stuff added to it. I also liked the scene at the end where Bullitt is at the airport, but yes the rest of the movie is definitely on the slower side. I think that there are some other pretty good car chase scenes out there like Gone in Sixty Seconds, Ronin, The Bourne Identity, The French Connection, both versions of The Italian Job, Vanishing Point and so forth. My favorite part of the GISS scene was when the helicopter was chasing him through the flood control area next to the freeway and he hits the nitrous button leaving them all behind him in the dust. But again, I highly doubt with how safe and cautious movies tend to be nowadays that he was actually doing 150 mph, or anywhere even close to that. And because of that, I don't think it's likely that we'll see a better car chase that beats Bullitt in terms of the realism needed to get the shots that they needed.