• The wife can wait for her husband to light the menorah when he arrives.
• The wife can light the menorah at the correct time and exempt the husband from lighting when he arrives. If possible, he should try to hear the blessings being recited by someone else lighting.

To avoid any misunderstanding, the couple should discuss the situation beforehand and come to a mutually acceptable arrangement.

• If he begins his journey after plag haMincha (1 1/4 hours before sunset), he should light before he leaves.
• If he must leave before this time but will arrive at his destination before dawn, he should light when he arrives.
• If he must leave before this time and will arrive after dawn, he should light while traveling (see next question).

• He has a bed to sleep in.
• He is paying for the journey (e.g. train, boat).
• He does not hold the menorah in his hand but puts it down somewhere.
• There is no fire hazard.

If all these conditions are met, he should light with blessings, even if he is able to light only one candle. If these conditions are not met, he is exempt from lighting.

Excerpted from "Guidelines" - more than 200 commonly asked questions about Chanukah (Targum/Feldheim).