A Queensland man has appeared in court after allegedly driving at high speed with fake police lights and a boot full of explosives.

Police say they intercepted Glyn William Newton, 30, on the Ipswich Motorway at Wacol in western Brisbane on Friday night.

Police allege he was driving at speeds of up to 160 kilometres per hour with red and blue flashing lights on the dashboard similar to that of a police vehicle.

Officers uncovered 11 canisters filled with explosive materials inside his car.

Newton is charged with possessing dangerous drugs, manufacturing explosives, authority required to possess explosives, fail to correctly store explosives, unauthorised transport of explosives and assuming designation or description of a police officer.

Today police prosecutor Sergeant Kevin Carmont told Ipswich Magistrates Court the explosive devices prompted the closure of a section of the motorway for several hours.

He said specialist officers were called in to detonate the devices, causing substantial damage to the area.

The court heard Newton told police the explosive devices were homemade fireworks, not homemade bombs.

Sergeant Carmont said Newton also directed officers to a website where he bought materials to make the devices.

Police allege further searches of Newton's car and home uncovered a stash of fake and genuine police equipment, including police shirts, badges and a baton.

Magistrate Matthew McLaughlin said Newton's behaviour was bizarre, but the likelihood of him causing harm to anyone was "quite remote".

"He says he wants to be a police officer ... he may have done some damage to those plans," Magistrate McLaughlin concluded.

He granted Newton bail on the basis there was no evidence to suggest the explosive devices were anything other than fireworks.

He will appear in an Ipswich court again next month.