Palestine Today says that Al Arabiya has a report claiming that traffic lights in Jerusalem are rigged to discriminate against Palestinian Arabs.
The purpose, of course, is simply to humiliate them, according to the article.
The article claims that traffic lights on roads leading to Arab towns in the West Bank are timed to be much shorter than the lights towards Jewish towns. It is described as "the occupation deliberately tightening the noose on the Palestinians." via their nefarious Zionist traffic light policy.
I would have loved to listen in on that Knesset debate.
UPDATE: Here's the Al Jazeera report of the racist signals. I must have mistranslated, these are traffic lights to Jerusalem from the West Bank.