Looks like it's the tyregrip property that you're looking for. Alternatively you could edit the vehicle's handling if you'd like the effect at all times. Handling settings to play around with are tractionMultiplier and tractionLoss. brakeDeceleration, steeringLock and engineAcceleration can also be finetuned as greater acceleration power means you would lose traction a lot easier, whereas less brake power would result in even less braking ability. Reducing steeringlock makes it harder to take turns at lower speeds. If you don't want to edit all vehicles' handlings, perhaps you could make a script that increases and decreases those handling properties by percentage of their original values.