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A computing device in a vehicle can be programmed to determine a virtual steerable path polynomial including a lane change maneuver, update the virtual steerable path polynomial by controlling a vehicle trajectory, and, pilot the vehicle based on the virtual steerable path polynomial. The computer f

A computing device in a vehicle can be programmed to determine a virtual steerable path polynomial including a lane change maneuver, update the virtual steerable path polynomial by controlling a vehicle trajectory, and, pilot the vehicle based on the virtual steerable path polynomial. The computer further programmed to determine the virtual steerable path polynomial based on the vehicle trajectory.

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1. A method, comprising: determining a virtual steerable path polynomial including a lane change maneuver;then updating the virtual steerable path polynomial to pilot the vehicle for the lane change maneuver;piloting the vehicle based on the updated virtual steerable path polynomial;then canceling t

1. A method, comprising: determining a virtual steerable path polynomial including a lane change maneuver;then updating the virtual steerable path polynomial to pilot the vehicle for the lane change maneuver;piloting the vehicle based on the updated virtual steerable path polynomial;then canceling the lane change maneuver;further updating, by inverting portions of, the virtual steerable path polynomial; andpiloting the vehicle based on the further updated virtual steerable path polynomial. 2. The method of claim 1, further comprising determining the virtual steerable path polynomial based on the vehicle trajectory, wherein the vehicle trajectory includes vehicle position, vehicle direction, vehicle speed and vehicle lateral acceleration and vehicle longitudinal acceleration. 3. The method of claim 2, further comprising determining the lane change maneuver based on the vehicle trajectory, adjacent lane traffic and lateral acceleration constraints. 4. The method of claim 1, wherein piloting the vehicle based on the virtual steerable path polynomial includes determining when to perform the lane change maneuver. 5. The method of claim 1, wherein piloting the vehicle based on the virtual steerable path polynomial includes switching from a steerable path polynomial lacking the lane change maneuver to the virtual steerable path polynomial that includes the lane change maneuver. 6. The method of claim 1, wherein controlling the trajectory includes adjusting vehicle speed based on adjacent lane traffic. 7. The method of claim 6, wherein controlling the trajectory includes increasing or decreasing vehicle speed. 8. The method of claim 1, further comprising inverting the trajectory upon canceling the lane change maneuver. 9. The method of claim 1, wherein the virtual steerable path polynomial is based on Bezier curves. 10. The method of claim 1, wherein the virtual steerable path polynomial is based on lateral acceleration constraints. 11. A computer comprising a processor and a memory, the memory storing instructions executable by the processor such that the computer is programmed to: determine a virtual steerable path polynomial including a lane change maneuver;then update the virtual steerable path polynomial to pilot the vehicle for the lane change maneuver;pilot the vehicle based on the updated virtual steerable path polynomial;then cancel the lane change maneuver;further update, by inverting portions of, the virtual steerable path polynomial; andpilot the vehicle based on the further updated virtual steerable path polynomial. 12. The computer of claim 11, further programmed to determine the virtual steerable path polynomial based on the vehicle trajectory, wherein the vehicle trajectory includes vehicle position, vehicle direction, vehicle speed and vehicle lateral and longitudinal acceleration. 13. The computer of claim 12, further programmed to determine the lane change maneuver based on the vehicle trajectory, adjacent lane traffic and lateral acceleration constraints. 14. The computer of claim 11, further programmed to pilot the vehicle based on the virtual steerable path polynomial including by determining when to perform the lane change maneuver. 15. The computer of claim 11, further programmed to pilot the vehicle based on the virtual steerable path polynomial including by switching from a steerable path polynomial not including the lane change maneuver to the virtual steerable path polynomial including the lane change maneuver. 16. The computer of claim 11, further programmed to control the trajectory including adjusting vehicle speed based on adjacent lane traffic. 17. The computer of claim 15, wherein control the trajectory includes increasing or decreasing vehicle speed. 18. The computer of claim 11, further programmed to invert the trajectory upon canceling the lane change maneuver. 19. The computer of claim 11, wherein the virtual steerable path polynomial is based on Bezier curves. 20. The computer of claim 11, wherein the virtual steerable path polynomial is based on lateral acceleration constraints.