Aggressive or reckless driving.   California Vehicle Code Section 23103 makes it a crime to “drive a vehicle upon a highway in willful or wanton disregard for the safety of persons or property.” The Courts in Northern CA particularly Marin, Napa and Sonoma Counties look at speeding, swerving, tailgating or other displays to determine whether a driver violated the law under the RECKLESS Driving Code. 
A driver convicted under this statute in Northern CA can face up to $1,000 in fines and up to 30 days in jail in some of the northern CA counties depending upon your driving record, and priors. The penalties can be higher if the RECKLESS driving caused bodily injury or great bodily injury to someone other than the driver.RECKLESS DRIVING CA VEHICLE CODE SECTION 23103
Under the strict statutory language of VEHICLE CODE SECTION 23103
(a) A person who drives a vehicle upon a highway in willful or wanton disregard for the safety of persons or property is guilty of reckless driving.
(b) In addition, a person who drives a vehicle in an off street parking facility, as defined in subdivision (c) of Section 12500, in willful or wanton disregard for the safety of persons or property is guilty of reckless driving.
(c) Persons convicted of the offense of reckless driving shall be punished by imprisonment in a county jail for not less than five days nor more than 90 days or by a fine of not less than one hundred forty-five dollars ($145) nor more than one thousand dollars ($1,000), or by both that fine and imprisonment, except as provided in Section 23104 or 23105.
 (d) There are many defenses and mitigating circumstances for how we may be able to get your charges dismissed or greatly reduced. Here is one example below:
However, If you hire the right skilled, and experienced criminal defense attorney you might be able to get the same kind of recent result:  (SONOMA COUNTY SUPERIOR COURT), SANTA ROSA, CA:
Recent Result: (July 2017)
MISDEMEANOR RECKLESS DRIVING ON A HIGHWAY (VC 23103)- client faced 5 days jail and 24 months of informal probation – RESOLVED by a Deferred Entry of Judgment- In exchange  for a Court referral to the Alive at 25 Program and Attitudinal Dynamics of Driving Course,  the CASE is DISMISSED after completion of Programs with no arrest, criminal record, jail or probation.