The rules for the GNCTR are based on those from the previous year. Modifications are made by the hosting university.  A summary of the rules is shown below.
  Rules for designing the toboggans(as per GNCTR 1999)  are shown below
The complete rules for GNCTR 1999 can be viewed at the GNCTR 1999 site.
The GNCTR 2000 site is not yet available.

                The participants of the registered team must build the toboggan.
                Each member of the team must be a student, except in the case of
                noncompeting and graduate teams.
                Those toboggans having already taken part in the competition, in a
                previous year, are not forbidden to do so again, but will not be eligible
                for one of the three place finishes. They will thus be registered in the
                non-competing category.
                Each toboggan (including all accessories required for the race) cannot
                have a weight of more than 136.4 kg or 300 lbs.
                Each toboggan must be able to accommodate 5 participants.
                The running surface of each toboggan must be made of Portland
                Cement based concrete only.
                Only wax is permitted to facilitate a smoother running surface. Utilization
                of varnish, paint, epoxy, Teflon or similar products is forbidden.
                Utilization of reinforcements and admixtures is not only admissible, but
                Each toboggan must be equipped with a braking system which is to be
                constructed to allow for stopping in as short a distance as possible.
                No toboggan can be designed in a way whereby pieces are lost or
                come unfastened during the descent or braking process.
                Each team should provide a method to attach a cable to the toboggan to
                facilitate the ascent up the hill. It is highly recommended to install a 50
                mm diameter ring to the front of the toboggan (no ring, no tow up the

3.2 Security and Safety 
                Each toboggan must be equipped with a roll bar to prevent participants
                from becoming injured in case of an overturn.
                No sharp or protruding parts are permitted in the interior or exterior of
                the toboggan.
                The participants can not be attached to the toboggan, nor can they be
                attached to each other.
                No toboggan can be enclosed. Each participant must be able to exit
                freely at all times.
                If the Organizing Committee deems a toboggan to be in any way unsafe,
                it will be barred from performing its runs.

3.3 Toboggan Transport and Storage 
                Each team is responsible at all times for its toboggans and all of its
                equipment and belongings. It is up to the team to make appropriate
                arrangements to avoid damage of the toboggan during its transport. The
                Organizing Committee is not responsible for any damages incurred to
                the toboggans, equipment, or belongings of any team or its members
                incurred during transport.
                Each team must claim its toboggan before the deadline (after the races).
                After this time, toboggans become the property of University of
                Waterloo and will be disposed of.
                Each team will uncrate their toboggan for the exhibition and the race.
                Teams must re-crate their toboggan and load it for transport after the
                exhibition. Teams are strongly encouraged to construct toboggans and
                crates for minimal assembly and disassembly.