Police in Perth have charged two men with hoon offences after they were clocked at high speed on the Mitchell Freeway.

It is alleged a 23-year-old man from Lockridge, on P-plates, was picked up by a fixed speed camera travelling at 226 kilometres per hour on the freeway five days ago.

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He has been charged with reckless driving.

Meanwhile a 20-year-old man from Churchlands has had his car impounded after being clocked at 152 kilometres per hour on the Mitchell Freeway in Joondalup last Friday.

He has also been charged with reckless driving.