People across Londonderry have been given the opportunity to pay their respects to Philippa Reynolds as two Books of Condolence, one on each side of the River Foyle, were opened.
The PSNI District Commander also made a renewed appeal for people he believes were at or near the scene of the fatal crash on Saturday, to come forward.
The books, located at the Tower Museum and the Waterside Library will stay open until Saturday afternoon.
Among the first to add his signature was the city's first citizen, Mayor Kevin Campbell, ahead of his attendance at Constable Reynolds' funeral in Co Antrim.
“The tragic death of Constable Reynolds had generated widespread condemnation within all sections of the community.
“On behalf of the citizens of our city, I wish to express my sincere condolences to the family and friends of Constable Reynolds.
“I would also like to convey my sympathy to her colleagues in the PSNI. It’s a tragic loss of a young life and the entire community is deeply shocked and saddened.”
A large contingent from the PSNI's G District will also form an integral part of the funeral service today, including her commanding officer Stephen Cargin who said a full investigation into Philippa's death is still ongoing.
“We believe that there are a few people who were at the scene in the early hours of the morning who haven't contacted us and I would appeal to them to do that as soon as possible.
“We are in a new dispensation of policing and Philippa typified this new police service and locally people have recognised that.
“My officers are walking into shops or just out on patrol and people are stopping them, shaking their hands and offering their condolences.
“I know that prayers have been said for her and her family in all churches and that is making a huge difference.
“We have been flooded with messages too from police services across the globe.
“While these messages have sustained us in these difficult days, we make a special appeal to the small number of people we believe were at the scene of the crash or saw what happened.
“We want them to get in contact, they may think they do not have anything new to tell us but we really do want to hear from them,” he said.