Haynesworth plans to turn himself in next week, Fairfax County police spokeswoman Shelley Broderick said. Simple assault is considered a Class 1 misdemeanor in Virginia and is punishable by up to 12 months in a county jail and a $2,500 fine.
Chad Speck, Haynesworth's agent, told NFL Network insider Jason La Canfora that his client hasn't been contacted by the authorities regarding this incident.
"Albert did not put his hands on anyone," Speck said. "These allegations are completely false."
Speck said the other motorist in the incident only decided to contact the authorities after realizing who Haynesworth was.
"This is a case of someone looking to get his 15 minutes of fame at Albert's expense," Speck said.
Snyder said he didn't know all the facts, although he admitted he's "disappointed" in investing a seven-year, $100 million contract in the oft-troubled lineman two years ago. Snyder wouldn't necessarily say that Haynesworth was on his way out of Washington -- that decision is up to Allen and Shanahan.
Redskins spokesman Tony Wyllie said in an e-mail that team officials are gathering information about the incident and wouldn't comment further. He earlier told The Post that the team wasn't aware of the incident until contacted by the newspaper.
Broderick said the confrontation occurred Wednesday morning on Fairfax County Parkway, where a man driving a 1994 Honda Civic gave a "non-verbal hand gesture" to another man, later identified as Haynesworth, in a pickup whom he believed was tailgating him.
According to the officer, when both vehicles came to a stoplight, the driver of the pickup got out of his vehicle, exchanged words with the Civic driver, 38, and then struck him. The pickup driver then returned to his vehicle and drove off.
Broderick wouldn't provide further details.
It is the second time in less than two years that Haynesworth has been involved in an alleged aggressive-driving incident. Haynesworth was sued in May 2009 by a Tennessee man who claimed Haynesworth drove "like a maniac" and sent the man's car crashing into a concrete median of an interstate highway in Brentwood, Tenn., in December 2008, allegedly leaving the driver paralyzed.
Jon Perry, the Tennessee attorney representing the man Haynesworth collided with in the accident, told the Washington Examiner in December 2010 that the suit is still pending and his client is permanently disabled.
That accident occurred four days after Haynesworth was placed on supervised probation for driving more than 100 mph on the same interstate in March 2008.
Haynesworth, a two-time All-Pro defensive lineman, has run into his share of trouble while with the Redskins. He repeatedly clashed with Shanahan and was suspended without pay for the final four games of this past season for "conduct detrimental to the club." He has played in just 20 games for the team since he signed his big contract, which includes $41 million in guaranteed money.
The Associated Press contributed to this report.