The problem has caused the postponement of the MotoGP race scheduled for Motegi in Japan next weekend.

BBC: Volcano cloud threatens Formula 1 preparations

It was not only Rossi and Lorenzo that provided the Japanese fans with some edge-of-the-seat overtaking at Motegi.

BBC: Matt Roberts MotoGP column

Code-named Motegi, after the famed Japanese racetrack, the XPS One is designed, says Dell, with the space-conscious Japanese market in mind.

FORBES: The Second Coming

Mobilityland Corporation, the Japanese operator of the Motegi venue, north of Tokyo, said it hoped MotoGP fans could attend the event later in the season.

BBC: Volcanic ash cloud forces postponement of Japan MotoGP

Lorenzo, fresh from his victory at Motegi in Japan last week, delighted his home crowd in Jerez with the best time of one minute 38.93 seconds.

CNN: Lorenzo claims MotoGP pole in Spain

Two reactors have recently been restarted, and Trade and Industry Minister Toshimitsu Motegi said others could follow if it was considered safe by the nuclear authority.

BBC: Japan PM Abe praises Fukushima nuclear work during visit

By capturing first place in Sunday's Indy 300 race in Motegi, Japan, Patrick shook free of critics who have downplayed her sports celebrity as more flash than substance.

FORBES: Show Danica The Money

Originally scheduled for April 24 at the Twin Ring Motegi circuit, the BBC reported that roads leading to Tokyo required repair and sections of the track were cracked in the earth quake.

FORBES: Japanese Disaster: What Are The Impacts On The Auto Industry?

New Zealander Scott Dixon, who won the first race of the IRL season, has also been cleared to race after he suffered a broken wrist in a two-car accident during the Indy Japan 300 on 13 April 13 at Motegi.

BBC: De Ferran set for Indy return