Coupling arrangement for a dolly, and a dolly equipped with such an arrangement, includes a female connecting part and a male connecting part. Each of the metal interconnection layers is disposed within each of the dielectric layers and a dielectric constant of at least one of the dielectric layers is less than about 2. The muffler further includes a piping merge zone between the merge entry and the merge exit for commingling exhaust flows from the two engine exhaust manifolds. The shelves are adapted to encourage all animals to use them as passageways under the highway. The protection member can be fastened to the body.