  The aim of this paper is to understand whether Distributed Ledger
Technologies (DLTs) are ready to support complex services, such as those
related to Intelligent Transportation Systems (ITS). In smart transportation
services, a huge amount of sensed data is generated by a multitude of vehicles.
While DLTs provide very interesting features, such as immutability,
traceability and verifiability of data, some doubts on the scalability and
responsiveness of these technologies appear to be well-founded. We propose an
architecture for ITS that resorts to DLT features. Moreover, we provide
experimental results of a real test-bed over IOTA, a promising DLT for IoT.
Results clearly show that, while the viability of the proposal cannot be
rejected, further work is needed on the responsiveness of DLT infrastructures.
