Used by multiple Big Blue Ground subtypes (track, road, car gobjs).
Different gobjs interpret the same offsets differently.
Track gobj (ID 32): uses xC8 as HSD_JObj*[30], xCC as u8[30] flags. Road gobj (ID 34): uses xCC as f32 velocity, xD0/xD8 for position. Car gobj (ID 33): per-lane data at 0x40-byte stride from gp+D4, with fields: state(+0), target(+4), delta(+8), pos Vec3(+C), lateral(+20), direction(+2C), gravity(+30), height(+34), velocity(+38), accel(+3C), rotation(+40), amplitude(+44), angular_vel(+48). Per-lane data for the Big Blue car gobj (ID 33), 0x40-byte stride from gp+D4. Only the fields read by the game logic are named here.