El carril bici hace que el trayecto sea más seguro, pero aun así hay que ceder el paso en algunos cruces.

Carril bici is the common everyday term in Spain for bike lane. It is a compact noun+noun expression, which Spanish often uses in set phrases.

You may also hear:

• carril para bicicletas
• carril ciclista

But carril bici is the most natural and usual option in Spain in normal speech and writing.

Because hacer que + clause normally triggers the subjunctive.

Here, el carril bici hace que el trayecto sea más seguro means that the bike lane causes the journey to be safer. After this kind of expression of cause or effect, Spanish uses the subjunctive in the second clause.

So:

• hace que ... sea = correct
• hace que ... es = not correct here

Yes. That sentence is also natural.

Compare:

• El carril bici hace que el trayecto sea más seguro
• El carril bici hace el trayecto más seguro

The meaning is basically the same. The version with que + subjunctive sounds a bit more fully expressed, while the shorter version is a little more direct.

Because seguro agrees with trayecto, and trayecto is masculine singular: el trayecto.

So:

• el trayecto sea más seguro
• la ruta sea más segura

The adjective must match the noun it describes.

Trayecto usually refers to the route, journey, or stretch of travel between two points, especially in practical everyday contexts such as commuting, cycling, or transport.

Viaje is broader and often means trip in a more general sense.

In this sentence, trayecto fits well because the focus is on moving through streets and crossings, not on a whole trip as an event.

Aun así means even so, all the same, or nevertheless.

So the sentence says:

• the bike lane makes the journey safer,
• but even so, you still have to yield at some crossings.

It adds a contrast: something is safer, but a rule or caution still applies.

In modern standard spelling, aun así is usually written without the accent.

A useful rule is:

• aún with an accent usually means still / yet
• aun without an accent usually means something more like even

Examples:

• Aún no ha llegado = He still hasn’t arrived.
• Aun así = Even so / nevertheless.

So in this fixed expression, aun así, the form without the accent is normal.

Hay que + infinitive expresses an impersonal, general obligation: one must, you have to, it is necessary to.

That works very well for rules, instructions, and traffic situations because it applies to anyone, not to one specific person.

Compare:

• Hay que ceder el paso = One must / you have to yield.
• Tienes que ceder el paso = You have to yield.
  This speaks directly to one person.
• Debes ceder el paso = You must yield.
  This also addresses one person more directly.

Yes. Ceder el paso is the standard traffic expression for to yield or to give way.

Literally, it is something like to yield the passage/right of way.

This is a very useful phrase to remember because it is the normal wording in road contexts in Spain. You will even see the road sign CEDA EL PASO.

A related phrase, dar paso, exists too, but in traffic rules ceder el paso is the standard expression.

Here, cruces means places where roads, paths, or lanes cross — so crossings, junctions, or intersections, depending on context.

Intersecciones is also possible, but:

• cruces is very common in everyday language
• intersecciones can sound a bit more technical or formal

In a sentence about cycling and road rules, cruces sounds very natural.

Because en is used here for location: at/in some crossings.

So:

• en algunos cruces = at some junctions/crossings

Also, there is no article before algunos cruces because algunos already acts as the determiner.

Compare:

• en algunos cruces = at some crossings
• en los cruces = at the crossings / at crossings in general, depending on context