While traveling you should pray Qasr. Qasr means shortening. It applies only to prayers with four rak`ahs: Zhuhr, `Asr and `Isha’.  Shortening them means to pray two rak`ahs instead of four.

After having done so, you don’t need to perform the regular Sunnahs except Witr. One should not skip Witr. It should be prayed as three rak`ahs or a minimum of one rak`ah.

I pray to Allah to inspire us all to be diligent in performing Prayer.

For further details, you may refer to my answer linked here:

http://askthescholar.com/question-details.aspx?qstID=37688