
I'll try. There are various ways to get on HWY 1 South.
The absolute best way is to ride the bus from the Yongsan Bus station for 4000 won! Especially the first time. The second best way is take a friend who knows. Let him/her drive! If you are not an experienced driver in Korea, do that. I will not recommend experimentation the first time.
Once you get on the highway, Monday through Friday, ease your way to the left lane and remain there, or second from the left if you are afraid to drive fast. (On weekends, the Left lane is strictly for Buses! Keep out of it or get your picture taken and your husband's commander may get a ticket in the mail.)
A common way- cross the Banpo Bridge (Right turn out Gate 52) keep straight through Sobingo intersection, uphill keep far right and then NEXT left onto lower level of the bridge. (saves one stoplight at other end) If you end up on upper level don't panic, it is the same road, just go straight. Either way, AFTER the bridge, ease your way to the far left lane. You will have a couple of blocks to do this, forcing your way in, watching for any break, 1/2 car length is enough, and using your signal. Women usually put their arm out the window,waving it sort of like a left turn signal. That will bluff any vehicle except a Bus or Cement Mixer. After you are in the left lane, stay there and you will come to a light by the Express Bus Terminal. The Marriot Hotel is very tall on your left. You will have no choice but to turn left at the green arrow.
After turning left, stay in your lane (NOT the FAR right). After about three blocks DO get in the far right. Eventually you will see a sign, " Highway 1" and you are in line to get on it-one lane-far right. Once parallel to the highway,
start trying to turn across the traffic as soon as possible after the plastic traffic cones. Use the aforementioned procedure. Working your way to the far left or second from the left. This may take 5 miles at 80 KM per hour to accomplish. Don't panic. Just as you think, "Hey this isn't so bad", you will see big signs that will make you wonder about changing lanes. Don't. If Everyone is passing you, either get with the traffic or move right. Eventually you will see a sign that says toll booth. Carefully maneuver to a lane close to the left, pull a ticket like the vehicle in front does, and keep it to turn in at Osan City. Keep left or near left lanes, and follow the signs past Suwon or Suweon and it wont be long until you see Osan signs. Move appropriately to the right. Nothing says Osan Air Base. Turn at Osan. Pay the toll in won and give them the ticket. (Less than 3000). Turn left at the second intersection (light). Go a couple miles until it says Osan Air Base, right at the light. Be careful after that, I think it is easy to screw up now- you should turn left before the road veers right- we'll need more specific help from Osanites to find the right gate.
POVs can't go in straight, and you come out a different gate than you go in. But you elected to drive! Good Luck.