In County Suffolk, England, many fine breeds of "heavy Horses" are raised. It is in their honor that this most favored weave is traditionally made. In Suffolk, the horseshoes are always hung so that the luck flows into the horseshoe's "U", thus preserving the prosperity of the home and all who dwell within it.
If you hang a small horseshoe in your vehicle, it is said to protect you from harm.
In either case, a horseshoe will bring you luck.