After the terrorist attack at the airport in Brussels, the subject of airport security became Topic A. No surprise there.

It’s also no surprise that more solutions are being suggested to improve airport security.

Remember what happened after 9/11?

Major U.S. international airports saw their security perimeter increase around the airport.

No private vehicles were permitted. Only passengers could enter, and from a point outside the airport’s entrance. No meters and greeters were allowed.

The result? Airports moved efficiently and airline performance soared.

Passengers were happy.

But airport concessionaires, newsstands, rental car agencies, and restaurants complained about a substantial drop in revenue, and the perimeter restrictions were soon relaxed.

The main question remains: Is this about security or commerce?

Will roadblocks work again, or do we need to redesign mass transit and traffic flow to airports?

Some argue that if we did that, we’d be transferring the risk of terrorist attacks to other crowded areas, like subways or train stations.

I am certainly in favor of security perimeters around the airports.

They worked after 9/11, and they could work again now.

For more information about travel safety, check out:

• How Travel Security Could Change After Recent Terrorist Attacks
• What Could Change With Heightened Travel Security
• What a Worldwide Travel Alert Means for You

Keep reading for more travel tips.