 Signs indicating this designation have been placed periodically on both sides of US 29.For most of its route through Virginia, US 29 has been constructed to be at least four lanes along its route, with the two short exceptions being where the highway passes through Manassas National Battlefield Park, where it is two lanes wide for approximately three miles, and through Fairfax and Arlington counties, where it is sometimes wider.US 29 in Virginia has eleven highway by-pass routes around various cities and towns.