Progress: the Katy Freeway in Houston, Texas, spans across 26 lanes making it the worlds widest. The freeway is broken down in to 12 main lanes (six in each direction), eight feeder lanes.
Fwiw, feeder lanes probably shouldn't be counted in Texas because they're basically glorified city streets. Businesses can have entrances and exits on frontage roads, so there's not really anything special about them except that they have a slightly higher speed limit (50~60mph vs 40~45mph) and they have immediate access to the highway.