As soon as you know you will be late, send a realistic estimate or say when you can update it. Explain which arrangement may need changing and let the other person decide how to proceed. Use a safe way to communicate and revise the estimate if it changes materially.
Running late feels uncomfortable, so you send nearly there while still far away. The person waiting cannot tell whether to start without you or change the plan.
Send a realistic estimate as soon as you know the delay. If you do not yet know, say that and give the next update point. Use a safe method and avoid messaging while driving or doing anything that requires your attention.
Let them adjust
Explain whether the delay affects a booking, meeting or shared responsibility. Ask whether they should proceed without you where that is an option. Do not assume that the original arrangement can simply move.
Update the estimate if it changes materially. On arrival, acknowledge the wait and address any practical consequence. Later, review the cause if it is likely to recur. A travel estimate may need revision, or preparation may need to begin earlier. The immediate message should help the other person make a decision with the time they have, instead of keeping them attached to an optimistic arrival promise.
Giving an uncertain travel delay a useful update point
An illustrative exampleConsider a delayed journey to a shared appointment. You are safely stopped and can send a message, but do not yet know the arrival time. You say: "The journey is delayed and I will miss the agreed start. I do not have a reliable estimate yet; I will update you when the service provides one. Please let me know whether you need to begin without me." Once you have a credible estimate, you send it and explain whether the booking or task can still work. If the estimate changes substantially, you update it instead of repeating that you are nearly there. On arrival, you acknowledge the wait and address the practical consequence of the delay.
Send information the other person can use
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When you keep underestimating arrival times
Review the journey after the immediate situation is resolved. Check preparation, travel assumptions and the time needed between commitments. A recurring delay may need a larger buffer or a different appointment arrangement. During the current delay, avoid replacing an uncertain estimate with an optimistic promise. If a booking has its own limits, check those terms instead of assuming the start can move. Give the person waiting enough information to make their own decision, and accept that the original plan may no longer be workable.
A useful delay message
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