A gap is a smaller entrance way into traffic than a hole is, I believe.
First, you need to know how fast the oncoming traffic is going. Obviously if traffic is moving slowly, you don't need a large gap. If traffic is moving fast, you need a larger gap. Secondly, you should know how long it will take you to speed up to the speed limit. Finally, if you are not sure if you can make it in a gap, don't try to. There will be another gap. The people who are behind you will wait. Be safe, be smart.
In the US, we say you are merging into traffic. In Canada, some years ago, it was called squeezing into traffic.
Inability to judge a safe gap in oncoming traffic
Need at least 4-second gap in traffic
Patrick Chegwe Chukwuma has written: 'Gap acceptance parameters in traffic flow processes'
Two seconds.
No. The Darien Gap prevents any traffic (aside from all-terrain vehicles and adventurers) between North America and South America.
4
about 2 seconds
Left turns go last in the US as we know unless you're at a traffic light. Left turns must yield to oncoming traffic and the oncoming traffic's right turns. While you're waiting to make your left what you want to do is wait for a wide enough gap in between cars to make your left turn safely. When you see that gap in between cars, make your left.
I don't think they make the traffic stop at all! You take your life in your hands anywhere you step off the curb in London. Don't press the button - mind the gap and pray!