I found this thing at Ganton's beach (East beach basically) and it doesn't do anything to me that i still wonder why am i still reporting it, i feel stupid but it's uncomfortable lol.
I checked the location and I can confirm that the object is a speed pickup. There are several at the ramps of /hp (Half Pipe). However, this pickup and another one on the other side of /hp (see first image below) are under /hp's track.
You can see the track of /hp just above my helicopter. The pickup is at the wall to the left, right below the rotor.