Question Randomize my Road

Hi!
I have an issue with my project. I have 4 different prefabs and I want to put them in random order on my road.
Kind of:
1, 3, 2, 4, 2, 1 etc.

I already have a code that put chosen prefabs to a List and put it on my Scene, but now I need to put it by hand and it's looping, so my road is kind of random... But not in way that i want it. I want to Unity add it automatically and for example throw away the last position of the list and randomly add new diffrent rather than last.

And at least I want to Unity randomize my road in way that the same prefabs don't be side by side.
For example:
1, 2, 4, 4, 4, 3, 2, 1

My Code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using System.Linq;
4. using UnityEngine;
5.  
6. public class RoadSpawner : MonoBehaviour
7.    {
8.         public List<GameObject> roads;
9.         private float offset = 8f;
10.  
11.         void Start()
12.         {
13.              if (roads != null && roads.Count > 0)
14.              {
15.                   roads = roads.OrderBy(r => r.transform.position.z).ToList();
16.              }
17.         }
18.  
19.        public void MoveRoads()
20.        {
21.             GameObject moveRoad = roads[0];
22.             roads.Remove(moveRoad);
23.             float newZ = roads[roads.Count - 1].transform.position.z + offset;
24.             moveRoad.transform.position = new Vector3(0, 0, newZ);
25.             roads.Add(moveRoad);
26.        }
27.  
28. }

 

Done

 

I have no idea what this means, can you rephrase it?

The easiest way to do this would be to just add them to the List one by one, and if the randomly generated one matches the previous one, reroll your random selection. There are other ways, easiest to figure them out is to Google "random array with no repeats".