A 44-year-old Fairfax County man was charged three times during a 24-hour period with driving while intoxicated, released twice on personal bond and finally held in jail on a $1,000 bond, police reported.

James D. Block, of 8504 Mount Zephyr Dr. in the Alexandria area of Fairfax County, was first arrested about 1:30 p.m. Wednesday when a patrol officer noticed him driving a van erratically on Patton Boulevard near Mount Vernon Memorial Parkway, police said. He was charged with driving while intoxicated and carrying a concealed weapon.

After being released on personal bond, Block was arrested a second time at 12:30 a.m. yesterday when an officer noticed him driving a sedan erratically on Richmond Highway near Russell Road, police said.

About 12 hours later, Block was arrested while driving a van on Gateshead Road near Richmond Highway, police said. He was stopped after police received an anonymous telephone tip, spokesman Philip Lively said.

Under Virginia law, individuals charged with driving while intoxicated are released on their own recognizance, after being held several hours for "sobering up" in the jail, or until someone picks them up, said county prosecutor Robert F. Horan Jr.

Horan said Block was held on a money bond after the third charge because of the seriousness of the penalties involved--a mandatory 30-day jail term--if Block is convicted of all three offenses. The penalty for a second offense includes a mandatory 48 hours in jail. There is no mandatory jail term for a first offense.