As for I-73/I-840 going northbound towards Bryan interchange, I-840 uses left 3 lanes, while I-73 North uses right 2 lanes (one on the far right is an exit only lane while the other is just optional for continuing on I-840 or exit off for I-73/Bryan), for I-73 going north, 2 lanes are for I-73 North, one lane for Bryan Blvd eastbound on a separate ramp.
Going the opposite way, I-73 South is 3 lanes, approaching I-840/Bryan interchange. I-73 uses 2 right lanes, (the middle one is an optional for both Bryan Blvd East or turn to continue on I-73 South). The left lane of I-73 is an exit only for Bryan Blvd. Now, onto the I-73 south ramp towards I-840 West, both lanes are for I-83/I-840 Southbound, while I-840 east is a left exit... a separate ramp. (both exits from I-73 South for Bryan and I-840 East are left exits)
At the Friendly Ave interchange, I-73/I-840 going northbound is now 4 lanes.