How to use glVertexAttribPointer() function correctly for repeated attributes

Question

Hello! I’m trying to render a cube all red, but did not want to specify the color for all vertices in order to save space. For example, we would do so in the traditional way:

GLfloat vertices[] = {
     // Position          // Normal     // Color
    -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f, 1.0f, 0.0f, 0.0f,
    -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f, 1.0f, 0.0f, 0.0f,

    -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f, 1.0f, 0.0f, 0.0f,
    -0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f, 1.0f, 0.0f, 0.0f,

    -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,

     0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f, 1.0f, 0.0f, 0.0f,

    -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f, 1.0f, 0.0f, 0.0f,

    -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
    -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f, 1.0f, 0.0f, 0.0f,
};

GLuint cubeVAO, cubeVBO;
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);

glGenBuffers(1, &cubeVBO);
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

// Position
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(GLfloat), BUFFER_OFFSET(0));
glEnableVertexAttribArray(0);

// Normal
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(GLfloat), BUFFER_OFFSET(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(1);

// Color
glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 9 * sizeof(GLfloat), BUFFER_OFFSET(6 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);

But the vertices contain the attribute color repeated. The question is: Is there any way to specify the same color for all vehicles without repeating it in the array?