 SR 234 continues northwest, intersecting Balls Ford Road before reaching a trumpet interchange with I-66, at exit 44 on I-66.SR 234 joins the interstate in a concurrency east for three miles to a partial cloverleaf interchange with Sudley Road at exit 47, where SR 234 leaves the concurrency and meets the northern end of SR 234 Business.SR 234 heads north from I-66 as a four-lane divided highway that reduces to two lanes at the entrance to the Manassas Campus of Northern Virginia Community College, and then enters Manassas National Battlefield Park, site of the First and Second Battles of Bull Run.