What does the plus and minus in D gear mean?

[JosieAnn]

D gear's plus and minus refers to being able to push the gearshift lever from D gear to the plus/minus side while driving, which simulates a manual transmission, preventing the transmission from automatically upshifting; when pushed to the plus side, the gear will increase, and when pushed to the minus side, the gear will decrease. The D gear of a car, also known as the drive gear, when the gearshift lever is in this position, the hydraulic system control unit will automatically engage the corresponding forward gear oil circuit based on throttle opening signal and vehicle speed signal; the D gear of automatic transmission models does not have engine braking function, and will continuously shift to higher gears as downhill speed increases, making the vehicle go faster and faster, requiring constant use of the foot brake to control speed.