There could be various reasons why a person might drive slowly behind you for a short period and then speed up. Here are a few possible explanations:
Coincidence: It's possible that the person driving behind you had no intention to follow you specifically. They might have been driving slowly due to traffic conditions, road hazards, or some other reason unrelated to you. The timing of their acceleration could have been coincidental.
Caution: The driver might have been exercising caution, especially if they noticed you walking on the sidewalk and wanted to ensure your safety. Driving slowly for a brief period could have been their way of being cautious and considerate before proceeding at a regular speed.
Observation: The driver might have observed something of interest or noticed a landmark, which caused them to slow down momentarily. Once they passed or reached their destination, they may have resumed their normal speed.
Navigation: It's possible that the driver was using a navigation app or GPS system and momentarily slowed down to confirm their route or check their directions. Once they had verified their location, they accelerated to continue their journey.
Distraction: The driver might have been momentarily distracted by something inside or outside their vehicle, leading them to unintentionally drive slower. Once they regained focus, they increased their speed.
Impatience: Although less likely, it's possible that the driver was impatient or in a hurry and chose to tailgate you briefly to encourage you to walk faster or move out of their way. This behavior, however, is not recommended and is generally considered unsafe.
Without further context or information, it's challenging to determine the exact motivation or intent behind the driver's actions. It's important to prioritize personal safety and be aware of your surroundings, but it's also possible that the situation was simply coincidental or unrelated to you.