Help clamping player movement boundaries

Questions & Answers
1

I have a vehicle that moves left or right on the X-axis using wheel colliders. It is walled in by two rigid bodies on either side of the X-axis but I want the the vehicle to stop just before hitting the walls, as hitting them will cause the vehicle to move off track. This basic script works:

	public static float xBoundry = 18.2f;

        if(transform.position.x < -xBoundry + 1.5f)
			transform.position = new Vector3(-xBoundry + 1.5f, 0, 0);
		else if
			(transform.position.x > xBoundry - 1.5f)
				transform.position = new Vector3(xBoundry - 1.5f, 0, 0);

But it causes the vehicle to jitter as its collider continually exceeds the boundary and gets pushed back. I read that using Mathf.Clamp can set a boundary without the jitter so I tried it in my script:

gas = Input.GetAxis("Horizontal");
		
		frontLeftWheel.motorTorque = enginePower * gas;
		frontRightWheel.motorTorque = enginePower * gas;
		rearLeftWheel.motorTorque = enginePower * gas;
		rearRightWheel.motorTorque = enginePower * gas;
		frontRightMiddle.motorTorque = enginePower * gas;
		frontRightBackMiddle.motorTorque = enginePower * gas;
		frontLeftMiddle.motorTorque = enginePower * gas;
		backLeftMiddle.motorTorque = enginePower * gas;

transform.position.x = Mathf.Clamp (transform.position.x + gas, -18.2f, 18.2f);

But I get the error

Cannot modify a value type return value of `UnityEngine.Transform.position’. Consider storing the value in a temporary variable

I’m a little confused on how I put all this information together.

2

The transform position is a readonly vector. Store the changing values of the “position” in a temporary variable and assign back to the transform’s position.

Vector temp = new Vector3(-xBoundry + 1.5f, 0, 0);
transform.position = temp;