I have my own map matching algorithm and I want to compare it's accuracy to some other algorithms. Is there a free trace dataset that has a confirmed match for each trace (ground truth), so I can perform the comparison? Even more, I would be interested in a whole benchmark/test suite for this purpose.
This paper by Newsom and Krumm on map-matching includes a test dataset that you can use to evaluate other algorithms. It's called "Hidden Markov Map Matching Through Noise and Sparseness."
Finally, I've found trace dataset suitable for the benchmarking, containing 100 traces from different parts of the world. It is described in the article called Dataset for testing and training of map-matching algorithms by Kubicka et al. (available on IEEE).
The dataset itself is stored on zenodo.org as an open-access dataset.