The Transtar warp drive is a type of Faster-than-light drive used by Starcom and the Shadow Force. The Transtar Warp Drive allows them to open a tunnel in hyperspace, allowing travel through a universe in which the speed of light is much faster than it is in this one. This provides faster-than-light travel without the problem of relativistic effects.
The Transtar warp drive cannot be used among the innermost planets, because the strain on the space-time continuum too close to a star could cause the star to go nova, destroying all of the innermost planets. The safest distance for use of the Starbridges is outside the orbit of Mars (Starcom episode: "Hot Enough for You?"), (Starcom Bible)