Investigations by racing authorities and officials at Wolverhampton Raceocurse in Britain have determined that the Polytrack artificial surface in use at the track is not responsible for five equine fatalities and a series of recent spills.

Wolverhampton, Britain’s busiest racecourse, is one of three tracks in the country which has Polytrack — the others being Lingfield Park and Kempton Park.

The surface has proved itself for many years in Britain but never before has one track raced so often on it.

Wolverhampton staged its 100th race day of 2006 on Dec. 15, surpassing the previous British record of 97 at Lingfield Park. The Midlands course is due to have another 10 fixtures by the end of the year