Changes coming in airport markings

Take the poll located to the right, [poll removed] and then read the story for the answer, more information, and one more puzzle. The answer will be posted in a reply in a week or so.

The taxi-way center line will now be surrounded with dashed lines when leading up to a hold line. This makes it more obvious that you need to stop soon. Here is an example of an intersection at a taxi-way that leads to a hold line.

Here is one more change. There are 4 differences in the below picture compared to the normal runway hold line, one of which has already been described. (You can see this in place at the Providence Airport - they are the first airport to get the new markings). What are the 4 differences, and for extra credit, why?

If you attended the Safety Seminar and know the answers, please wait a bit to see if anyone else can identify the 4 changes.

Here's the answer

The four differences are:

• The dashed taxiway centerline leading up to the hold line provide a warning that there is an upcoming hold line.
• The hold line now extends completely across the taxiway, beyond the taxiway edge lines.
• The dashed lines on the runway side of the hold line are white. This makes it more obvious which side of the hold line is part of the runway environment.
• The red/white runway signs are painted on both sides of the taxiway. This makes it easier for both pilot and copilot in a large jet aircraft to see the signs.