Gap Connector Idea for CMVs Based on Articulated Bus Design

Vicki has long had an idea for a “gap connector” to close the gap between truck and trailer similar to that which is used on articulated buses, like the one shown below.

Just wondering... Why can't trucks have a 'gap connector' between the tractor and trailer like long commercial buses do?Yes, engineers would have to design some set-up that would make it easy for

  • tractors and trailers to move freely about the kingpin without interference;
  • truckers to access the air lines as needed;
  • exhaust from the stacks to escape;
  • refrigeration units not to overheat; and
  • exhaust from refrigeration units to escape.

But if reducing wind drag and air resistance between the tractor and trailer is a worthy goal, this kind of apparatus — or something very similar — should be considered.

So, as of February 17, 2015, she is putting her idea out in public.*

If you look on Wikipedia for “articulated bus“, you will see images of buses made with “two rigid sections linked by a pivoting joint.”

On such a bus, you will see that the pivoting joint is covered with a flexible device.

Gap connector covering pivot joint in an articulated bus

This device reminds Vicki of a Slinky® or a bendable straw.

When the bus turns, the device flexes to accommodate the movement.

Vicki has been unable to find the name of this device.

However, one of our readers is likely to know it or be able to find this information.


Why Can’t Trucks Have a Gap Connector?

Why can’t truck manufacturers come up with a gap connector like this to use between tractors and dry van trailers?

Is it because the angles at which trucks turn may be much sharper than buses turn?

Any device for closing the gap between truck and trailer would have to be easy to move so that truckers who do drops and hooks could easily attach it between the truck and trailer.

It is possible that an extra connection device would need to be put on the fronts of trailers.

OK, Vicki’s idea is now public.

Now, let’s see what happens in the marketplace…

(Note: An alternative spelling might be “gap connecter” — ending with “er” instead of “or” — although the idea for this device has no bearing on any product or service by a similar name.)

* Note: This article was updated in 2019.


truck drivers money saving tip iconMoney saving tip: It is well known that in order to increase a truck’s fuel economy, air resistance or drag needs to be reduced or eliminated from around the vehicle. One of the most difficult places to reduce drag has been between the tractor and trailer.

So that articulation can occur, there is only so much shortening of the distance that can take place between the back of the tractor and the front of the trailer.

Items that create a vortex of air have been able to reduce drag in this area of the truck to a certain extent, as have trailer nose cones.

Another potential positive that could result from having a gap connector installed is less opportunity for theft of load locks from behind tractors.


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