He's a person with whom I work. (defining)

to conceal, or indubitate, his existency

This tradition dates back to the Penal Laws, when it was forbidden for Catholic priests to say Mass in public. To get around the problem, the Mass was often celebrated secretly in people's homes, and afterwards, those in attendance stayed on for breakfast. This was often followed by a full day of merriment - but only after the priest had finished his breakfast and taken his leave! As the years went by, and the Penal Laws were repealed, the custom of The Stations continued, especially in Ireland's more rural areas.

In an effort to beat the traffic jams, they opted to take an indirect route to their destination.