Roadblocks
HANDS UP GET OUT OF THE VEHICLE

As an example, 'block e' would block the east of the street with my vehicle, preventing other vehicles (but not pedestrians) from driving towards that direction. This obviously should only be the case for cars, or large vehicles such as dropships and skyships (not motorbikes).

Motorbikes should be able to weave through the block and also not be able to block the road themselves at all.

And maybe spike strips for WJF to damage and potentially blow tires?

Can imagine toll blocks on certain streets where people check vehicles and things like that.

Could depend on the type of tire you have on the vehicle.

As for roadblocks, I like the idea, but it would have to be extremely short duration. Maybe a minute or two. The theme files often mention how densely packed Red is. Now I just started playing here, so I don't know how rare vehicles are on Red. But even if only one out of a thousand people has a vehicle, that is still A LOT of traffic. As someone else mentioned, at least a few of those NPCs are going to get irked enough to ram the roadblock.

I imagine that the roadblock would have to work almost like a pursuit move. Two vehicles are racing down the street, and one pulls far enough ahead to block the other vehicle and prevent it from making further progress into the next "room" on the grid. Otherwise, by the time the intended target shows up, there would ICly be a bunch of NPC vehicles stuck at the roadblock and the target could just flip a quick U-turn and head in the other direction, or otherwise 'avoid' the roadblock.