BUS AT CAL Square 15: FLAT TRAMLINES.

 Square `15 is not at all texture and has no relief, it is flat. However it introduces a fun new stitch which you may not have come across before and the flatness serves as a nice contrast to the other squares. Above is the front and below is the back or reverse view, they differ.
 

 close up view of the back view: this almost looks knitted or an unusual weave.

Close up view of the front, can you see the ''tramlines''?

The new stitch used is the LINKED double treble. It makes it grow very fast and is a nice flexible flat fabric as a result of the way it is worked.
It will be abbreviated to LDTr.

With 6 mm hook chain 17 and then change to the 5 mm hook and chain 4.
Row 1: first stitch of the row: insert hook into 2nd ch from hook and pull up a loop ( 2 loops on hook)
insert hook into 3rd ch from hook and pull up a loop ( 3 loops on hook), insert hook into 4th ch from hook and pull up  a loop( 4 loops on hook), now yarn over and pull through 2 loops at a time , three times, first LDTr made.

For the next LDTr and every next LDTr in the row you use the horizontal strands that have now appeared on the LDTr worked.
See Photo where 2 pins indicate the loops where the hook is inserted before pulling up a loop.

The green pin loop is used first followed by the red pin loop and then the hook is inserted in the next stitch for the final pulling up of a loop, when there are 4 loops on the hook they are worked off in pairs, YO and pull through 2 loops at a time, 3 times.

After inserting the hook in the first loop- green pin- yo and pulling up a loop.

Inserting hook under second loop on previous LDTr.

After yo and pulling up a loop.

Now inserting under the loops of the next stitch , as in photo.
then yo and pull up loop: there will be 4 loops on hook.

4 loops on hook stage.

yo and pull through 2 loops: 3 loops left.

yo, through two loops and then 2 loops left.

yo and pull through 2 loops: 1 loop left and the linked double treble stitch is completed.
Repeat across the row until 18 LDTr completed.

Row 2: ch 1 and work a dc into each of the 18 sts., turn.
Row 3 is as row 1, the first stitch however is slightly different: ch 3 and use the 2nd and 3rd ch for the start of the loop collecting, then insert into the stitch at the base of the chains and use that to collect the 4th loop, then finish the LDTr as before, the next LDTr are all worked as described above with photos in row 1.

Repeat row 2 and 3 until the square measures 15 cm, ending on a dc row.