Speed Limit Signs Vs. Advisory Speed Signs: What's The Difference?

You may also see these signs posted within a yellow diamond with an arrow pointing forward, indicating a speed limit change ahead. These types of signs are called speed advisory signs. They will always be lower number values than the white speed limit signs around them, because driving slower on a trickier path is always the safer option. You may drive faster than the number on a speed advisory sign, but you're putting your own safety at risk. In terms of the law, there are also important distinctions made between speed limit and speed advisory signs.