bié bìngpái qíxíng.

别 is used to make a negative command, so here it means don’t.

In this sentence, 别并排骑行 means something like:

• Don’t ride side by side.

This 别 + verb/verb phrase pattern is very common in spoken and written Chinese:

• 别说话。 = Don’t talk.
• 别跑。 = Don’t run.
• 别担心。 = Don’t worry.

So the basic structure here is:

• 别 + 并排骑行

which means don’t do the action of riding side by side.

This is a very common question.

• 不 usually means not in statements.
• 别 usually means don’t in commands.

Compare:

• 我不骑车。 = I do not ride a bike / I’m not riding a bike.
• 别骑车。 = Don’t ride a bike.

So in this sentence, 不并排骑行 would not sound right as a normal prohibition. For a warning or instruction, 别 is the natural choice.

Yes. 不要并排骑行 is also correct.

The difference is mainly tone and style:

• 别并排骑行 = shorter, very common, direct
• 不要并排骑行 = also correct, slightly fuller
• On signs, rules, or announcements, both can appear

In many everyday situations, 别 is the most natural concise form.

You may also see even more formal sign-style wording such as:

• 请勿并排骑行。 = Please do not ride side by side.

并排 means side by side, abreast, or in parallel.

It describes two or more people or things being arranged next to each other in a row.

Examples:

• 两个人并排站着。 = Two people are standing side by side.
• 两辆车并排行驶。 = Two vehicles are traveling side by side.

In 别并排骑行, 并排 tells you how the riding is happening: the riders are riding next to each other.

Because 并排 functions adverbially here: it describes the manner of the action 骑行.

Chinese word order often goes:

• negative command + manner + verb

So:

• 别 = don’t
• 并排 = side by side
• 骑行 = ride / travel by bike

Literally, it is something like:

• Don’t side-by-side ride.

That sounds unnatural in English, but the Chinese order is normal.

A similar pattern would be:

• 别慢慢走。 = Don’t walk slowly.
• 别大声说话。 = Don’t speak loudly.

骑行 means to ride, usually referring to traveling by bicycle, and sometimes more broadly to cycling as an activity.

Compared with 骑车:

• 骑车 = ride a bike / ride a vehicle; more everyday and conversational
• 骑行 = a bit more formal, often seen in signs, rules, notices, sports, or written contexts

So:

• 别并排骑车。 = perfectly understandable, more everyday
• 别并排骑行。 = slightly more formal, very suitable for a sign or instruction

It can function as a verb or a noun, depending on context.

In this sentence, it is a verb:

• 别并排骑行。 = Don’t ride side by side.

But it can also be a noun meaning cycling or a ride in other contexts:

• 我喜欢骑行。 = I like cycling.
• 周末去骑行吧。 = Let’s go cycling this weekend.

So its role depends on how it is used in the sentence.

Because in Chinese, commands and warnings often omit the subject when it is obvious.

So 别并排骑行 really means something like:

• You, don’t ride side by side
• or Please do not ride side by side

But the you is understood from context and does not need to be stated.

This is very common in signs and instructions:

• 别停车。 = Don’t park.
• 请排队。 = Please line up.
• 注意安全。 = Pay attention to safety.

In 骑行, 行 is pronounced xíng, not háng.

So the full pronunciation is:

• 别 — bié
• 并排 — bìngpái
• 骑行 — qíxíng

This is important because 行 has multiple pronunciations in Chinese. Here, in 骑行, it relates to traveling or moving, so xíng is the correct reading.

It sounds very natural on a sign, in a safety warning, or in an official instruction.

In everyday speech, a person might also say:

• 别并排骑车。
• 你们别并排骑。

These feel a bit more conversational.

So:

• 别并排骑行。 = natural, but slightly formal or sign-like
• 别并排骑车。 = more everyday spoken Mandarin

Yes, definitely. 并排 is not limited to cycling. It can be used for people, objects, vehicles, and more.

Examples:

• 椅子并排放着。 = The chairs are placed side by side.
• 他们并排坐着。 = They are sitting side by side.
• 两艘船并排行驶。 = Two boats are traveling side by side.

So in 别并排骑行, 并排 is just one specific use of a broader word.

No, that word order is not natural.

The normal order is:

• 别并排骑行

because 并排 modifies 骑行 and usually comes before the verb.

If you say 别骑行并排, it sounds awkward because the adverbial idea 并排 is being placed in the wrong spot.

So the correct pattern is:

• 别 + manner/state + verb

and not:

• 别 + verb + manner in this case.