According to this report he was cycling on the southbound side, presumably in a southerly direction. Also keep in mind that while Mr. Heppell may have been in good health he was 80 years old and even a very low speed collision could be serious enough to cause death to anyone especially if suffering a head injury. Also consider unintentional falls are the leading cause of injury death for people over 65 in the U.S. with over three times the number two cause, motor vehicle deaths.
That said, accidents do happen and some are even unavoidable with no real blame attributable and until more is known there is little point in speculating.