This sign now belongs to the past...
The reasons given by the government are the bid to carry out large-scale fuel savings and concerns about fuel supply in view of the political and social unrest in the Arab world. On examination both reasons seem rather laughable. First of all, modern cars (and motorbikes, for that matter) don't burn that much fuel when they're cruising along at 120 kph in top gear, which means that the supposed fuel savings obtained by dropping the speed to 110 kph (68 mph) are so slight that they won't make much difference in the medium term, which is how most government plans work.