There's a well-hidden one here (number 22), which requires access to the unfinished railway track suspended above the city. We've marked the entrance on the map, but check the video to make sure you've got the right path. There's very little grip on the train track, so be careful to get your line right as you tackle the left kink.
Apart from that, it's all about speed. Traffic can get in the way, so you might need a few attempts down the main stretch, but you'll get there soon enough.
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