If you are currently sitting at 670 out of 671 roads discovered in Forza Horizon 6, tearing your hair out while staring at a seemingly perfect map of Japan, you are definitely not alone. The community has run into a frustrating visual bug where the map highlights several unexplored roads in full white or orange, making them look 100% completed when they actually are not.Because of this visual glitch, you can no longer rely on the classic method of looking for grayed-out lines or tiny uncolored gaps. Thankfully, players have discovered a brilliant workaround using a map UI trick that makes tracking down that elusive final road a breeze.The Disappearing Fast Travel LifehackThe entire trick revolves around exploiting how the map's fast travel mechanic behaves. Even when a road looks completed due to the glitch, the game's user interface still knows it hasn't been driven. If you hover your cursor directly over an undriven road segment, the "Fast Travel" button prompt at the bottom of your screen instantly disappears. By watching for this prompt to blink away, you can pinpoint the exact spot you missed.Here is the step-by-step method players are using to sweep the map:Filter the Map completely: Before doing anything else, open your map filters and turn off everything. Clear out all races, PR stunts, houses, and festival sites so you have an entirely unobstructed view of the road network.The Mouse Sweep (PC Players): Zoom slightly out so you can see a decent-sized region of the grid, then rapidly swing your mouse cursor back and forth across the roads. Keep your eyes locked strictly on the button legend at the bottom of the screen. The very millisecond your cursor passes over an undriven section, the "X" or "A" Fast Travel prompt will briefly vanish.The Lawn-Mower Sweep (Xbox & Controller Players): Since analog sticks lack the rapid precision of a mouse, console players have adopted a systematic grid search. Using the D-pad, trace lines across the map like a lawn-mower—moving steadily from left to right, dropping down just a fraction, and then sweeping back from right to left while monitoring the prompt.Trigger the Discovery: Once you notice the prompt drop off, slow down and zero in on that exact millimeter of road. Drop a custom waypoint right on top of it, fast travel to the nearest validated road segment nearby, and drive over it to finally trigger your 671st road notification.Quick Tip: Don't look at theroads themselves while doing this search. Your eyes should be fixed entirely on the bottom of the screen where the button prompts live. Let the UI do the detective work for you.Common Trouble Spots in the Japan MapForza Horizon 6 features a highly dense, vertical recreation of Japan, which makes hiding missing segments incredibly easy. If you are doing your sweeps and want to know where to focus your efforts first, the community has identified several repeat-offender locations:Tokyo's Tiered Highways: The metropolitan area is packed with complex overpasses and multi-level highways. If you have driven the upper level, it will completely mask an uncompleted off-ramp or a lower-level road running directly underneath it on the 2D map view.The Northern Ski Resort: This is a major hotspot for the glitch. Multiple players have reported that the winding pathways and roads around the northern ski resort look completely filled in on both the main map and the mini-map, yet contain uncounted segments that instantly trigger the UI trick.Gravel Dead-Ends: Pay extra attention to small dirt paths, driveway stubs, and tiny turning circles. It is incredibly common to miss just a fraction of a millimeter at the absolute end of a dashed gravel path.Dual-Lane Highways: Some of the wider highways with central dividers require you to drive down both sides of the median. If you've only traveled one direction, the map might look fully colored, but the opposite lane is technically still waiting to be claimed.Instead of squinting at your screen for hours trying to find a broken pixel, give the fast travel sweep a shot. It takes a bit of patience to cover the whole map, but it is currently the most foolproof way to secure your completionist bragging rights.