105 runs through a few small town and goes to two lanes in several spots. Truck traffic keeps most of the overhanging limbs up above 13'.
Traffic approaching Cleveland can be bad. Traffic between Cleveland and Conroe will most likely be stacked up with the usual dare devil drivers trying to pass with on coming traffic in the no passing zones. Especially around the town of Cut n' Shoot. (Yep that is its name)
Coming down I-45 from Conroe to Spring can have a lot of traffic. Watch out for the Prince and Princess' cutting across five lanes of traffic to get the the Woodlands Mall at the Woodlands.
I will tell you that they drive only a little better here than they do in Chicago.
Traveling to Lake Charles from Spring I prefer to pay the tolls and take I-10 to the Northbound Beltway 8 Tollway all the way from Channelview/Galena Park to the Greens Point/Spring area. Exiting onto I-45 North to get to the area in Spring were I live.
105 is a little more scenic, I prefer that route on my motorcycle vs. riding on the Interstate. On the 105 most folks only try to drive around 70 mph. On the Interstates east of Houston most only drive 10 to 15 above posted limit but that puts me at 80 and 85 mph on a bike and that takes the fun out of it for me. West of Houston heading towards San Antonio when the speed limit increases to 75mph you will see quite a few folks running 90+ mph. I know this because I am doing 85 mph on my bike to keep from getting run over and some just pass me, others fly by me and are pushing enough air to cause my 750 lb cruiser to wiggle.