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Trap points are provided where goods trains and vehicles could run away and get onto passenger running lines. They are not usually provided where passenger lines interconnect. The intention is to stop the runaway vehicle before it can foul the running line.
Trap points are often implemented using catch points rather than a full turnout and spur or sand drag. Catch points may derail the vehicle and damage the track, but that is far preferable to a collision.
Creating a set of catch points in Templot means shortening a turnout template to contain only the switch part. You can do that manually using the F4 mouse action, or click the do > snap to catch points menu item. Usually you would use a short switch to save space, such as an REA size "A" switch.
This infographic shows how to insert a set of catch points in your track plan. Click the Play button below it to begin:
Sometimes a catch point consists of a single switch blade instead of a full set of points. In that case simply omit the unwanted rail -- click the do > omit rails and joint marks... menu item (CTRL+O):
Then untick the turnout-road crossing rail tickbox:
There is more about trap and catch points on Templot Club at: