It is generally considered safe to travel by car during pregnancy, even with a lower placenta and previous spotting. However, it is important to consult with your healthcare provider before making any decisions. They will be able to assess your specific situation and provide personalized advice based on factors such as the stability of your placenta, any underlying conditions, and your overall health. Your healthcare provider may recommend certain precautions such as taking breaks during the journey to stretch your legs and avoid prolonged sitting, staying hydrated, wearing comfortable clothing, and ensuring proper seat belt usage. Additionally, they may suggest avoiding bumpy roads or long periods of driving if you have any concerns about potential risks. Ultimately, it is crucial to prioritize your safety and well-being as well as that of your baby throughout the journey.