Assuming you're referring to US regulations, there isn't actually any law specifying what the limit is on this. 36" inches of gap between the front and the kingpin is common on van trailer and some flatbeds. The only regulation I can think of offhand here isn't a federal one, but for the state of Maine, which specifies a 3-1/2 foot max gap between the front of the trailer and the kingpin.
As far as it needs to go.
I have it on good authority that more atoms will fit in a semi trailer than you know what to do with. Of course, it all depends on what the atoms are of. Certainly a semi trailer full of hydrogen could possibly hold more atoms than a semi trailer full of plutonium--the plutonium atoms are larger than the hydrogen ones. The flipside is, hydrogen comes in many states. If you were to freeze the hydrogen you'd get far more atoms in the trailer than if you were to just squirt in a little gaseous hydrogen. if you were to put frozen H2 in a trailer, when it finally melted then gasified, the expansion would be considerable--enough to blow the doors off. Rest assured that if you called your fleet manager and told him the load blew the doors off he wouldn't be happy with you. In short, I have absolutely no idea how many atoms will fit in a semi. The answer is "a truck load".
that really depends on the situation. If you are following a semi trailer in your car the good rule of thumb is 3 seconds. Pick something on the side of the road... such as a tree... when the rear of the semi passes the tree count three seconds then the front of your vehicle should pass the tree. This will give you plenty of time to safely stop if need be at any speed. If the semi is following you and you feel they are too close it is advised to simply pull over or change lanes to let them pass.
Yes, they can travel without trailers. They're known as "bobtails" when there's no trailer attached. They can travel just as far as they could with a trailer. When a truck is running with an empty trailer or without a trailer, this is known as "deadhead", which is considered undesirable by companies, since they're typically not paid for deadhead miles.
You're talking about the trailer? Some specifics would be in order. On a tandem trailer, the axles are about three feet apart from each other. If you're referring to the distance between the trailer axles and the drive axles of the tractor, they're allowed to be a maximum of 41 feet apart, except in California, where they're only allowed a 40 ft. bridge between the two.
49 out of 50 states have a 41 ft. bridge between the drives and trailer tandems. California, being California, has a 40 ft. bridge between the drives and trailer tandems.
So Far Away
It is the far driver side of the front head.It is the far driver side of the front head.
So far, there is no trailer for the Maximum Ride movie. In fact, no one has even been cast. The movie was announced on like, 2007 and has yet to have anything done. There is only a film company and director etc. and I don't think they've done the script yet. So as far as a trailer goes, there is none. There is, however, a trailer for the book.
Locomotives are far more efficient than trailer trucks.