Amanda Bynes has reportedly "gone off the grid" following her misdemeanour hit-and-run charges.

The troubled actress may spend up to one year in jail, six months for each count, should she be found guilty of the crimes.

In April Bynes was accused of hitting a vehicle in a rental car while driving on the 101 Hollywood Freeway and then fleeing the scene.

This case was dropped then reopened when she was accused of a second hit-and-run on August 4.

Although her driver's licence is suspended, Bynes was photographed on Tuesday operating a vehicle illegally in Los Angeles and possibly smoking marijuana behind the wheel.

"She seems to be having some serious mental health issues and she's always out of it. She really doesn't seem to be in touch with reality."

"Amanda's completely gone off the grid. She won't speak with her manager, her agent, her publicist; she's not returning anybody's phone calls," a friend revealed to Radar Online.

Concerned police told TMZ "She's on the same road as my wife and kids and I'm scared about getting a call in the middle of the night that my little one is dead."

The cop added, "She's addicted to something and she's driving a deadly weapon and is going to kill someone. It scares the s**t out of me."

Another cop said, "The public should be afraid of her. From looking at the photos, and what she's smoking, she has no sense of reality.  If she's not stopped she's gonna kill someone."

Bynes apparently doesn't believe that she needs help.

"Amanda is refusing to go to rehab or seek any form of psychiatric treatment or diagnosis, because it's clear something is up with her," the source revealed.

"She's a lost little girl right now."

- Cover Media