Two vehicles have been seized for a month after police caught the P-plate drivers allegedly racing at speeds of more than 70 km/h over the limit on Saturday.

A PT Cruiser and a Holden Commodore were allegedly speeding along Hepburn Avenue in Alexander Heights at nearly 150 km/h in a 70 km/h zone at 10.30pm.

Two P-plate cars were impounded after allegedly racing, clocking speeds of nearly 150km/h.

The pair, aged 18 and 19, have been charged with reckless driving and will face the Joondalup Magistrates Court at a later date.

The two cars have been impounded for 28 days.