Lamar Odom was arrested for "driving under the influence of alcohol and/or drugs" early Friday morning ... TMZ has learned.
The bust occurred in the San Fernando Valley at 3:54 AM. Lamar -- who was driving a white Mercedes SUV -- was popped by the California Highway Patrol and taken to a nearby station, where he was booked and is being held on $15,000 bail.
He was pulled over on the 101 Freeway for going too slow -- 50 MPH. Cops say Odom had been driving in a "serpentine manner."
Lamar initially did not respond to cops, and drove 3 exits before finally coming to a stop. Law enforcement sources tell TMZ he showed obvious signs of intoxication.
Lamar failed numerous field sobriety tests.
When Lamar was booked, we're told he refused all chemical tests.
Lamar's booking sheet shows he is 6'10" and 235 lbs.