James Ahn, who was the victim of the attack, said he was driving in Fremont in California last week when the woman pulled up next to his car and launched her tirade.
Footage shows the woman telling Mr Ahn to “go back to his country” before using her hands to slant her eyes.
“Oh my god! Chinese ugly!” she says.
Mr Ahn said the woman appeared to take issue with the speed at which he was driving.
“I was driving in Fremont last week and this lady started the racial harassment while threatening me on the road only because I wasn’t driving fast enough for her,” he wrote on Facebook.
“As I changed the lane, she kept driving towards my car gesturing to crush me and cutting in front of me to slam on the break.
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“There was no other incident before my friend started filming her, to save the road rage footage of her in case she ended up crushing my car.
“FYI racist lady, this is my country since I am a citizen plus veteran currently serving this country. Do not disrespect anyone by their race!”