Translate the given Spanish text to English

[Q]: The horn is coupled to a needle.
[A]: El cuerno se acopla a una aguja.


[Q]: A related testing method is also disclosed.
[A]: También se describe un método de prueba relacionado.


[Q]: However, said techniques are expensive and only developed countries are able to condition their roads with these systems.
[A]:
Sin embargo, tales técnicas son costosas y solamente los países avanzados son capaces de instrumentar sus carreteras mediante estos sistemas.