Continental Europeans have gone so long ¡ª two decades ¡ª without internal border controls that the younger generation doesn¡¯t know what life is like with them. For a glimpse of the past, and the fortress mentality setting in after the Paris terrorist attacks, look no further than France¡¯s frontier with Luxembourg.

Five days after the Paris murder spree, the highway into Luxembourg resembled a truck parking lot, with a two-hour wait as the police stopped and, occasionally, searched vehicles.

¡°What a pain in the neck,¡± said Alban Zammit, 43, a shaven-headed French truck driver who travels back and forth across the border with cargoes ranging from batteries to sacks of sugar. ¡°Is it just to give people the impression of increased security?¡±