fortfahren
to continue
To continue an action or speech that has already begun after an interruption.
Nach einer kurzen Pause fuhr der Professor mit seinem Vortrag fort.
After a short break, the professor continued with his lecture.

to continue / to drive away
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to continue
To continue an action or speech that has already begun after an interruption.
Nach einer kurzen Pause fuhr der Professor mit seinem Vortrag fort.
After a short break, the professor continued with his lecture.

'Fortfahren' (to continue / to drive away) is a separable verb. The prefix 'fort-' comes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Fahren Sie bitte mit Ihrer Erzählung fort.
Please continue with your story.
The auxiliary verb in the perfect tense depends on the meaning. For 'fortsetzen' (to continue an action), you use 'haben'. For 'wegfahren' (to drive away, change of location), you use 'sein'.
Er hat mit seiner Arbeit fortgefahren.
He continued with his work.
In the meaning 'fortsetzen' (to continue), what is being continued is often stated. This is usually done with the preposition 'mit' (+ dative) or an infinitive clause with 'zu'.
Wir fahren mit der Diskussion nach der Pause fort.
We will continue with the discussion after the break.
When 'fortfahren' means 'wegfahren' (to drive away), it always refers to a vehicle. In this case, it is often used without an object or a prepositional complement.
Der Zug wartete auf das Signal und fuhr dann fort.
The train waited for the signal and then drove away.
to arrive
'ankommen' and 'fortfahren' are opposites in this meaning. 'ankommen' means that someone reaches a place. 'fortfahren' means that someone drives away from a place in a vehicle. So it is about two directions: toward a place and away from a place. Important: 'fortfahren' can also mean 'to continue', but for this contrast only the meaning 'to drive away' is intended.

Nach einer kurzen Pause fährt der Bus wieder fort.
After a short break, the bus drives away again.
Am Morgen kommt der Lieferwagen vor dem Haus an.
In the morning, the delivery van arrives in front of the house.