Hi, I've responded to a nasty accident on the Highway and this traffic officer was holding a wand or something.

 

Spoiler

 

Where can I get one? I have noticed this in StopThePed: "Whether to use glowing stick (parking wand) to initiate on-foot traffic stop (yes/no)
OnFootTrafficUseWand=yes"

 

Can we perform traffic stops while on foot with that?

This was added to StopThePed a little back, you can still see it in the changelog.

To do a traffic stop on foot you need to press G and choose "slow down traffic" or "stop traffic" Then you can double click E (like with a normal stop) and then your character will raise that stick and pull the nearest vehicle over. From that point everything will work like a normal traffic stop with STP

Oh dang, that's amazing! Thank you so much!