Unless you are facing downhill, you should get your biting point before you check to make sure that you can go. You need to decide when it's appropriate to signal. Don't sit with the signal showing when you can't move out safely. The Official DSA Guide to Driving - The Essential Skills
Your browser does not support HTML 5 video, so you can not see video situations. To see the video situation, you must use a browser that supports HTML 5 span> video. Browsers that support HTML 5 span> videos can be downloaded from: