In California's vehicle code, there's a rule requiring drivers to keep a reasonable speed based on conditions: https://leginfo.legislature.ca.gov/faces/codes_d

In California's vehicle code, there's a rule requiring drivers to keep a reasonable speed based on conditions: https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=22350 https://leginfo.legislature.ca.gov/faces/codes_displaySectio... > No person shall drive a vehicle upon a highway at a speed greater than is reasonable or prudent having due regard for weather, visibility, the traffic on, and the surface and width of, the highway, and in no event at a speed which endangers the safety of persons or property. Maintaining the speed limit as another car gives 4 seconds of signaling and spends at least a full second in your lane is arguably not "reasonable". Where you live, if someone makes a reasonable signal to move into my lane, and I decide to not brake and rear-end them — you're saying that would be an automatic payout in my favor?