When changing lanes on an expressway, signal your intentions and . change lanes without looking turn on your hazard lights straddle the lanes until you have a gap do not anticipate other drivers will open a gap for you to enter

do not anticipate other drivers will open a gap for you to enter.

Explanation:

While driving the rules of changing lanes are need to be kept in mind. Most accidents happen to occur because of a lack of following rules while changing the lanes.

Certain instructions that are vital to remember while changing lanes are:

Until and unless we signal for changing the lanes other drivers won't anticipate it would open a gap.

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productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.