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Explain xkcd: It's 'cause you're dumb.
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Driving PSA
This PSA brought to you by several would-be assassins who tried to wave me in front of speeding cars in the last month and who will have to try harder next time.
Title text: This PSA brought to you by several would-be assassins who tried to wave me in front of speeding cars in the last month and who will have to try harder next time.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Created by a CLUELESS BOT DRIVING AT 72.42048 km/h (20.1168 m/s) (outpaced by raptor) - Please change this comment when editing this page. Do NOT delete this tag too soon.

A PSA is a Public Service Announcement. Some drivers, when having priority by the rules of the road (termed "right of way" in US legal statutes), will let others take it before them. At a 4-way stop, giving another driver the right of way is usually safe and courteous, but in other cases it can be dangerous. This comic is saying that people who exhibit this behavior dangerously can be assumed to be Terminator-style assassins, sent to kill you by sending you into contention with other traffic to make it look like an accident.

In this comic, the deferential driver is holding up a queue of vehicles (including a large tractor-trailer truck) that is obscuring the immediate view of oncoming traffic. But instead of simply turning left and reducing the queue, the deferential driver is waving Randall's car into traffic, perhaps because they forgot that the other lanes have priority over the crossing driver. The effect could be to wave them through right into the path of another car traveling at full speed, a clever way for a time-traveling assassin to take down one's target without arousing suspicion.

Not pulling into traffic when your view is obstructed is good advice, and Randall's comical exaggeration may make the advice more memorable. Always check for yourself that your way is clear, and if your view is blocked, sit tight.

However, Randall seems to be assuming that the waving gesture can only ever mean one thing: Pull all the way into traffic. However, it's more likely that a "waving out" gesture is intended to give the waiting car a chance to turn into the median strip (see details below). Viewing courteous behavior as conclusive evidence of a temporal assassination conspiracy is humorously ego-centric and improbable.

The title text explains that Randall made this PSA because he has experienced this multiple times in the last month, and that the assassins should try harder next time.

Alternate interpretation of the waving gesture

Note that in this comic, as illustrated above, there appears to be sufficient room in the median strip for the waiting car to pass the first set of lanes and stop in the median strip, protected from passing traffic on both sides, to legally wait for the second stream of traffic to safely subside. Waiting in this median turning area is a normal maneuver in rural US areas where these types of non-signaled intersections are common. There's no reason to assume that the supposed would-be assassin is not simply waving the waiting car to the safety of the median strip. Randall's message of caution is still sound, but he accidentally illustrated an intersection diagram that fails to optimally support his case.

Illustration showing room to safely turn left halfway, stopping in the median strip

Legality

Median strips are typically used to allow vehicles to safely make left turns without impeding the flow of traffic. When emerging from a side road, vehicles can cross the first lane(s) of traffic and wait in the median strip until it is safe to merge into the opposite lane(s).

  • In Texas, using the median strip to wait for a gap in traffic is generally acceptable. The Texas Department of Public Safety suggests that drivers use the median strip when appropriate. Source: Texas laws
  • Utah also allows it

Transcript

Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.
Driving PSA:
Random drivers can’t grant you the right of way as a gift.
[A T-intersection with a major road separated by a concrete median going from top to bottom, and a minor road coming from the left]
[A car is stopped at the end of the minor road]
First car [arrow pointing to car]: You, waiting to turn left
[A second car is stopped in the dedicated left turn lane of the right major road, with a third car, a truck hauling cargo, and a fourth car lined up behind it]
Second car [in a speech bubble]: You go ahead! I’m feeling generous.
Second car [arrow pointing to car]: Time traveler pretending to be polite
[In the second lane is a black arrow pointing upwards, with text below it reading 45 MPH, and a fifth car below the text]
Fifth car [arrow pointing to car]: Car that they are waving you into the path of
If someone waves you out, assume that they are an assassin sent from the future to kill you and make it look like an accident.


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