His work is 40 miles away; should he shorten his prayers?
Question

                I travel aproximately 40 miles to work by car everyday between Monday and Friday, leaving the vicinity of my city. I return home each day in the evening. May I shorthen my prayers at work even if I am travelling everyday?
Praise be to Allah.If a person 
          travels 100 km from his town, or thereabouts, he may follow the rulings 
          of travel by shortening his prayers, not fasting, combining his prayers 
          and wiping over his socks [in wudoo’] for three days, because this distance 
          is considered to be traveling. The same applies if he travels 80 km 
          or thereabouts; that is considered to be the distance which dictates 
          that prayers may be shortened according to the majority of scholars.