There aren't as many one-way streets in downtown Raleigh as in the past — the city converted several one-way streets to two-way a couple of years ago — but there are still a good number of them, and if you aren't familiar with the ever-changing downtown area, it pays to know before you go.
And adding to the confusion, many online maps don't specify when streets are one-way.
(Also please be aware of the big Wilmington Street closures tied to the construction of the FNB Tower.)
Here are the current (2018) one-way streets in downtown Raleigh, listed alphabetically:
New Bern Avenue
(Source: City of Raleigh)