Unfortunately Labor Day this year is a day to be cautious traveling and be prepared for delays or cancellations. The Moon is in Gemini (transportation) challenges the Sun in Virgo (schedules). Mars in Gemini* challenges Uranus in Pisces. This can create a greater potential for transportation accidents caused by aggressive, impatient behavior to accidents caused by mechanical malfunction. Another factor is possible severe weather conditions. The Sun and Moon challenge Jupiter (long distance and foreign travel), exacerbating any travel snafus. However, a favorable aspect between Venus and Mars should motivate people toward more social interaction and cooperation if a stressful travel situation arises.
* See my post, Mars Enters the Danger Zone: August 7-September 28, 2007 in the Predictions section.