If you feel uncomfortable, ask to stop at a well-lit public area immediately.
Trust your instincts is advice that predates the taxi era — it traces back to early 20th-century guidance for solo travelers using horse-drawn cabs in London, where cabstands near police call boxes were considered the safest exit points. The modern version emerged after several widely reported incidents: the 1990s "rogue minicab" wave in London, where unlicensed drivers preyed on women leaving nightclubs, prompted Transport for London's "Safer Travel at Night" campaign in 2003 and the creation of the Cabwise text service. More recently, Tokyo, Seoul, and Singapore have promoted convenience stores as 24-hour "safe stops" — well-lit, staffed, and camera-equipped. The same logic applies anywhere: a hotel lobby, a gas station, or a busy café gives you witnesses, lighting, and a way out. Don't worry about being polite; a driver acting in good faith will not be offended, and one acting in bad faith has already lost the right to your courtesy.