When driving on an open road in dry weather, you should keep a safe distance from the vehicle in front by maintaining at least a two-second time gap. This two-second gap allows sufficient time to react and brake safely if the vehicle ahead suddenly stops or slows down. To check the two-second rule, pick a stationary object like a road sign or bridge; when the vehicle in front passes it, start counting "one thousand one, one thousand two." If you reach the object before finishing the count, you are too close and should increase the distance. This rule assumes good driving conditions, including alertness, a well-maintained vehicle, and dry weather. In less ideal conditions, such as wet or icy roads, the gap should be increased for safety. The two-second rule is widely recommended by driving authorities and is essential for maintaining safe stopping distances on open roads in dry weather.