Abstract: A resilient guard rail assembly for use on one or both sides of a go-cart track, at dangerous curves or embankments to inhibit a go-cart from overrunning the track; said guard rail assembly including vehicle tires disposed in a tread to tread relationship with one side-wall of each tire engaging a surface, such as, the upper surface of the track. This guard rail assembly comprises a substantially continuous, ribbon-like, flexible, resilient rail section yieldingly spaced from a stationary anchor by a deformable vehicle tire which deforms or has a tendency to flex sideways, thereby absorbing substantially all of the energy transferred thereto incident to a collision thereagainst by a rapidly moving go-cart, whereby there is substantially no damage to the go-cart or the driver thereof.