Will smooth transport links still be ensured?
In the future relationship, the EU will aim to ensure a continued flow of goods and persons between the UK and the EU, but the UK, as a third country, does not have the same rights as a Member State.
The situation is very different depending on the mode of transport: Ensuring connectivity for air traffic and road haulage will require an agreement, e.g. on market access. Without an agreement, there is no fall-back to allow traffic to continue.