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An apparatus for affecting airflow in a gap between a lead vehicle and a connected trailing vehicle, includes a guide vane having a leading edge, a trailing edge, a gap side surface, and an outward facing surface, and a support apparatus mountable on a vehicle for supporting the guide vane in a vert

An apparatus for affecting airflow in a gap between a lead vehicle and a connected trailing vehicle, includes a guide vane having a leading edge, a trailing edge, a gap side surface, and an outward facing surface, and a support apparatus mountable on a vehicle for supporting the guide vane in a vertical orientation relative to the vehicle with a space between the vehicle and the guide vane gap side surface and with at least a portion of the vane extending beyond an end of the vehicle. The flow guide divides an air flow at the trailing edge of a vehicle to avoid the creation of turbulence in the air flow as it encounters the gap between the vehicle and the trailing vehicle.

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1. An apparatus for affecting airflow in a gap between a lead vehicle and a connected trailing vehicle, comprising: a guide vane having a leading edge and a trailing edge, the leading edge being bulbous and tapering to the trailing edge, and being mountable to have a gap side surface and an outward

1. An apparatus for affecting airflow in a gap between a lead vehicle and a connected trailing vehicle, comprising: a guide vane having a leading edge and a trailing edge, the leading edge being bulbous and tapering to the trailing edge, and being mountable to have a gap side surface and an outward facing surface; and,a support apparatus mountable on a vehicle for supporting the guide vane in a vertical orientation relative to the vehicle with a space between the vehicle and the guide vane gap side surface and with at least a portion of the vane extending beyond an end of the vehicle and, wherein the guide vane is freely pivotable on the pivot axis. 2. The apparatus of claim 1, wherein the support apparatus includes a pivot axis on which the guide vane is supported for pivotal movement on a vertical axis. 3. The apparatus of claim 2, comprising an actuator to control a pivot angle of the guide vane, the actuator responsive to air pressure sensed on the gap side surface and outer facing surface of the guide vane. 4. The apparatus of claim 1, comprising at least one vortex generator mounted on the trailing end of the guide vane. 5. The apparatus of claim 1, wherein the gap side surface has a convex curvature and the outward facing surface has a concave curvature. 6. The apparatus of claim 1, wherein the gap side surface has a concave curvature and the outward facing surface has a convex curvature. 7. The apparatus of claim 1, wherein the gap side surface has a convex curvature and the outward facing surface has a convex curvature. 8. The apparatus of claim 1, wherein the gap side surface has a concave curvature and the outward facing surface has a concave curvature. 9. A vehicle having an apparatus for affecting airflow in a gap between the vehicle and a connected trailing vehicle, comprising: a guide vane having a leading edge and a trailing edge, the leading edge being bulbous and tapering to the trailing edge, and being mountable to have a gap side surface and an outward facing surface; and,a support apparatus mounted on a vehicle for supporting the guide vane in a vertical orientation relative to the vehicle with a space between the vehicle and the guide vane gap side surface and with at least a portion of the vane extending beyond an end of the vehicle. 10. An apparatus for affecting airflow in a gap between a lead vehicle and a connected trailing vehicle, comprising: a guide vane having a leading edge and a trailing edge, and mountable to have a gap side surface and an outward facing surface; and,a support apparatus mountable on a vehicle for supporting the guide vane in a vertical orientation relative to the vehicle with a space between the vehicle and the guide vane gap side surface and with at least a portion of the vane extending beyond an end of the vehicle, the support apparatus including a pivot axis on which the guide vane is supported for free pivotal movement on a vertical axis to be pivotally self-adjusting in moving air. 11. The apparatus of claim 10, comprising at least one vortex generator mounted on the trailing end of the guide vane. 12. The apparatus of claim 10, wherein the gap side surface has a convex curvature and the outward facing surface has a concave curvature. 13. The apparatus of claim 10, wherein the gap side surface has a concave curvature and the outward facing surface has a convex curvature. 14. The apparatus of claim 10, wherein the gap side surface has a convex curvature and the outward facing surface is substantially flat. 15. The apparatus of claim 10, wherein the gap side surface is substantially flat and the outward facing surface has a convex curvature. 16. The apparatus of claim 10, wherein the gap side surface has a convex curvature and the outward facing surface has a convex curvature. 17. The apparatus of claim 10, wherein the gap side surface has a concave curvature and the outward facing surface has a concave curvature.