On the usage of 'line gap width'

[mdxiaohu]

User Story

I use the 'line-gap-width' attribute .
The assignment is as follows .

"line-width": 4,
line-gap-width: 2

Page Effects .

Rationale

I'm not sure if it's possible to set this attribute to achieve the effect shown in the following image .

As shown in the figure, there are gaps in the lines .
The difference is that .
The virtual line can be set to its width .
Instead of using the width of the original line .

Impact

I am allowed to use icons to complete this function, but I am not sure if there are any other feasible methods .
For example, modifying the width of virtual lines .

[HarelM]

Is this an issue it a question?
You can use different line layers with different widths using offset I believe.

[mdxiaohu]

Perhaps my description is not clear enough .
I use a geojson data source .
Created a layer .
For example, the following example .

https://jsfiddle.net/mdxiaohu/4j9b5m8d/3/

I don't know if a single layer can achieve this effect .
I saw the "line-gap-width" attribute and created a virtual line .
So, I was wondering if it's possible to modify the width of this virtual line since it can be created .
Perhaps this method is not feasible .
If a single layer is not possible, I will consider using image filling to achieve a double line style .

[HarelM]

I have no clue what is a virtual line.
As I said, you can create two lines, each with a different width.