[kneedrachen]

I've only lived in NJ and MD where I was old enough to ride a bike and both expressly prohibit bicycles, pedestrians and mopeds on the interstates, I'd say a good 75-90% of all entrace ramps have a posted sign detailing this.

[salvage_bikes]

It is illegal to drive a bicycle in the travel lanes of Interstate highways, but you can use the shoulder if there is no service/feeder road. I don't like riding the shoulder or the service roads, because of cager ragers, but riding the service roads is the major route to town where I live, and in many towns here (North East Texas), it is popular and common to ride on the feeder/access roads, especially in large pelotons.

If you ride on Interstate shoulders, you run into a lot of hazards: errant drivers, glass and debris (including dead cars, couches, auto parts and tire peelings), intersections (on/off ramps), road signs and markers (those egg shaped yellow things or reflectors), salmoning cyclists (rare on the shoulder of freeway but I've encountered them), and emergency vehicles and cutting drivers when traffic backs up below 25mph.

Originally Posted by omnivox42

I dont think cycling on the interstates are legal in Texas. ( I may be wrong). I have rode on a highway (highway 90) and had no issues with Johnny law. I see people biking there often. It has a HUUUGE shoulder. I think the difference is the lack of entrance/exit ramps, over passes, and 65+ mile an hour speed.

[salvage_bikes]

I've driven diesel trucks across much of the country, and in the southwest USA, there are some long stretches of interstate where it is not uncommon to see heavily loaded bicycles, usually lone riders with trailers, sometimes with bicycle motors. A lot of highways have signs prohibiting "horse drawn carriages and motorized cycles" though.

http://www.rogerwendell.com/images/cycling/from_lawrence_kansas_to_flagstaff_arizona_05-13-2006_thumb.jpg
http://www.rogerwendell.com/cycling.html

http://www.warmshowers.org/content/cycling-interstates-az-usa

[salvage_bikes]

http://jimsbikeblog.files.wordpress.com/2009/12/riding-the-shoulder-of-interstate-10-between-van-horn-and-kent-in-west-texas-photo-by-mike-ullner.jpg

[superj]

I ride the highway here in Corpus Christi Texas. Have to because there is no other way to get to the island. Used to do it everyday but have found a smoother stretch that is longer so I haven't ridden it in a while. No signs in this town prohibit bicycles on the highway but we used to have a fair amount of large road races here so that is probably why.

Being from SoCal though, I remember seeing those signs all around Los Angeles.

[MNRider]

I just checked with the highway patrol in North Dakota and it is perfectly legal to ride on the shoulders of the interstates and the shoulders or "as far right as is practical" on state and county highways. Good thing because there aren't many roads that parallel the interstates for very far around here. Trying to get from Point A to Point B by the backroads could double your mileage in some areas.